Members of a New Zealand biker gang perform the Haka to honour the victims of the mosque shootings in Christchurch, New Zealand, March 17, 2019. Picture taken March 17, 2019. REUTERS/Joseph Campbell 

Members of a New Zealand biker gang perform the Haka to honour the victims of the mosque shootings in Christchurch, New Zealand, March 17, 2019. Picture taken March 17, 2019. REUTERS/Joseph Campbell 

Members of a New Zealand biker gang pay their respects to the victims of the mosque shootings in Christchurch, New Zealand, March 17, 2019. Picture taken March 17, 2019. REUTERS/Joseph Campbell 

A boy touches an old lawn jockey that has been painted white on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A custom Pepsi themed sport bike sits idle by the extreme traffic on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Bikers cruise down Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A customized SUV travels through the heart of the Myrtle Beach strand on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A customized car drives down South Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Festival goers joke with police on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A biker is seen through the metal fencing blocking both sides of Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Festival goers take a group selfie while waiting in traffic on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A customized sport bike is lit in neon lights as it's driver waits in traffic on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A girl wears shorts sold along the tourist area on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A member of an area SWAT team checks the Myrtle Beach SkyWheel responding to a call that a tourist yielded a gun on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Bikers cruise to 9th Avenue South near Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Bikers ignore a fenced boundary after having engine problems from a overheated motorcycle on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 24, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Trinity Jai of Columbus, Ohio, uses a selfie stick and phone to take a photo during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A customized car cruises down Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

With a backdrop of the Myrtle Beach Sky Wheel, a biker cruises down Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Houston Oliver takes his dog Sosa for a walk along Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A biker and his rider are seen along Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Kenyatta Redd of Martinsville, Virginia watches the crowds from the Beach House Bar & Grill during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Bikers wait in traffic on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Members of the Sportsman Motorcycle Club of North Myrtle Beach, South Carolina check out the sights during the 2015 Atlantic Beach Memorial Day BikeFest in Atlantic Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Bikers cruise down Kings Highway during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

A customized SUV cruises down Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town. Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

T-shirts are displayed for sale at a vendor's booth during the 2015 Atlantic Beach Memorial Day BikeFest in Atlantic Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last yearÕs. REUTERS/Randall Hill

Bill Marion of Seattle, Washington, wears an Elvis mask at the Beach House Bar & Grill during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last yearÕs. REUTERS/Randall Hill

Brandy Shelton of Greensboro, North Carolina, 'twerks' for a group of bikers on Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last yearÕs. REUTERS/Randall Hill TPX IMAGES OF THE DAY

Bikers cruise down Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last yearÕs. REUTERS/Randall Hill

A biker burns out his tyre along Ocean Boulevard during the 2015 Atlantic Beach Memorial Day BikeFest in Myrtle Beach, South Carolina May 22, 2015. After three people were killed and seven wounded in shootings during 2014 Bikefest, State officials called for an end to the event that draws thousands to the family-friendly beach town.Their efforts were unsuccessful. Bikers returned to Myrtle Beach - just a week after a bloody motorcycle gang shootout in Waco, Texas. But this time authorities are more prepared, with dozens of new surveillance cameras and a police force three times the size of last year's. REUTERS/Randall Hill

Police officers inspect a weapon removed from a vehicle in the parking lot of the Twin Peaks restaurant, where nine motorcycle gang members were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

Members of the McLennan County Bomb Squad prepare to examine a vehicle in the parking lot of the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer inspects a weapon removed from a vehicle in the parking lot of the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

Police officers inspect a weapon removed from a vehicle in the parking lot of the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer inspects a weapon removed from a vehicle in the parking lot of the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A pistol is seen on the tailgate of a truck as police officers process evidence found in the vehicle, at the Twin Peaks restaurant where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A motorcycle is seen on a wrecker before it is removed from the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A motorcycle is seen on a wrecker before it is removed from the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer photographs a weapon after it was removed from a truck in the parking lot of the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A pistol is seen on the tailgate of a truck as police officers process evidence found in the vehicle, at the Twin Peaks restaurant where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

Police officers look at several motorcycles, which have been loaded onto a wrecker for removal from the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A tow truck driver prepares to leave with motorcycles from the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

Workers from a towing service prepare to load a motorcycle onto a truck at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer documents evidence removed from a vehicle at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer inspects a motorcycle before it is towed away from the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

Motorcylcs are seen atop a wrecker before being hauled from the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A bag bearing the name Rebel Riders sits on the tailgate of a pickup after it was removed from a vehicle by officers at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

Police officers sit in a van blocking the entrance to the Jack Harwell Detention Center, where gang members are being held after a shootout at a Twin Peaks restaurant, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer removes a jacket bearing the name of the Bandidos motorcycle gang from a vehicle at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer removes a jacket bearing the name of the Bandidos motorcycle gang from a vehicle at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer (R) removes a weapon from a vehicle parked at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer removes a weapon from a vehicle parked at the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer photographs a weapon removed from a truck in the parking lot of the Twin Peaks restaurant, where nine members of a motorcycle gang were shot and killed, in Waco, Texas May 19, 2015. Texas police asked rival motorcycle gangs on Tuesday to put aside their differences after the weekend brawl at the Waco restaurant that left nine people dead and 18 injured, calling for a halt to the carnage and threats of revenge attacks. REUTERS/Mike Stone 

A police officer photographs a weapon removed from a truck in the parking lot of the Twin Peaks restaurant where nine motorcycle gang members were shot and killed in Waco, Texas May 19, 2015. Police warned of revenge attacks from motorcycle gangs after 170 people were charged on Monday in connection with the shootout among rival bikers on Sunday that left nine dead and 18 wounded and turned a Texas restaurant into a blood-soaked crime scene. REUTERS/Mike Stone 

Sgt. Patrick Swanton of the Waco Police Department speaks to the media near a Twin Peaks restaurant where nine members of a motorcycle gang were shot and killed in Waco, Texas May 19, 2015. Police warned of revenge attacks from motorcycle gangs after 170 people were charged on Monday in connection with the shootout among rival bikers on Sunday that left nine dead and 18 wounded and turned a Texas restaurant into a blood-soaked crime scene. REUTERS/Mike Stone 

Sgt. Patrick Swanton of the Waco Police Department speaks to the media near a Twin Peaks restaurant where nine members of a motorcycle gang were shot and killed in Waco, Texas May 19, 2015. Police warned of revenge attacks from motorcycle gangs after 170 people were charged on Monday in connection with the shootout among rival bikers on Sunday that left nine dead and 18 wounded and turned a Texas restaurant into a blood-soaked crime scene. REUTERS/Mike Stone 

Police offices walk near a Twin Peaks restaurant where nine members of a motorcycle gang were shot and killed in Waco, Texas May 19, 2015. Police warned of revenge attacks from motorcycle gangs after 170 people were charged on Monday in connection with the shootout among rival bikers on Sunday that left nine dead and 18 wounded and turned a Texas restaurant into a blood-soaked crime scene. REUTERS/Mike Stone