A weapon collector holds a 44 caliber gun in his house in Bordeaux, France, March 19, 2018. REUTERS/Regis Duvignau 

A member of police special forces monitors the area as activists march at the main shopping and pedestrian street of Istiklal during a rally on the International Womens Day in Istanbul, Turkey March 8, 2018. REUTERS/Murad Sezer 

An armed gunman walks near burning tyres as protesters block Damascus-Aleppo highway during a protest against rising oil prices in the rebel-controlled area of Maaret al-Numan town in Idlib province, Syria May 19, 2016. REUTERS/Khalil Ashawi 

A Kurdish gunman uses a hammer to open a hole in a wall near Shi'ite militiamen positions during clashes Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

Kurdish gunmen look at a Shi'ite militiaman positions during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman holds a AK-47 rifle in front of a Shi'ite militiaman house during clashes Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

Kurdish gunmen look at the burning car of a Shi'ite militiaman in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman holds a AK-47 rifle in front of a Shi'ite militiaman house during clashes Tuz Khurmato, Iraq, April 24, 2016.REUTERS/Goran Tomasevic 

A Kurdish gunman looks at Shi'ite militiamen positions during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman stands in front of burned vehicle during clashes with Shi'ite militia in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman walks in front of burned vehicle during clashes with Shi'ite militia in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman looks at Shi'ite militiamen positions during clashes Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman runs for cover during clashes with Shi'ite militiamen in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic

Kurdish gunmen run on a street during clashes with Shi'ite militia in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic 

A Kurdish gunman runs across a street in Tuz Khurmato during clashes between Shi'ite militia and Kurdish gunmen, Iraq, April 24, 2016. REUTERS/Goran Tomasevic

A Kurdish gunman kicks a door as he searches for Shi'ite militiamen during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic

Kurdish gunmen search for Shi'ite militiamen during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic

Kurdish gunmen rest during clashes with a Shi'ite militia in Tuz Khurmato, Iraq, April 24, 2016.REUTERS/Goran Tomasevic 

A Kurdish gunman points his weapon at a picture of Shi'ite Imam Ali during clashes between Shi'ite militiamen and Kurdish gunmen in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic

Kurdish gunmen climb the house of a Shi'ite militiaman during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

A Kurdish gunman climbs a house of a Shi'ite militiaman during clashes in Tuz Khurmato, Iraq, April 24, 2016.REUTERS/Goran Tomasevic 

Kurdish gunmen hold their rifles in front of the burning house of a Shi'ite militiaman during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

An elderly Kurdish gunman takes down a Shi'ite militia flag during clashes in Tuz Khurmato, Iraq, April 24, 2016. REUTERS/Goran Tomasevic TPX IMAGES OF THE DAY

Armed gunmen attend the funeral of Fathi Zaydan, a Fatah official responsible for the Palestinian camp of Mieh Mieh, after an explosion that killed him yesterday, during his funeral in Mieh Mieh Palestinian refugee camp, near the port-city of Sidon, Lebanon, April 13, 2016. The wall shows a graffiti of late Palestinian leader Yasser Arafat. REUTERS/Ali Hashisho 

French police sharp shooters secure a ceremony attended by the French President in the courtyard of the Hotel des Invalides in Paris, France, November 19, 2015 after last Friday's series of deadly attacks in the French capital. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY ATTENTION EDITORS FRENCH LAW REQUIRES THAT FACES SPECIAL INTERVENTION POLICE FORCES ARE MASKED IN PUBLICATIONS WITHIN FRANCE

French police sharp shooters secure a ceremony attended by the French President in the courtyard of the Hotel des Invalides in Paris, France, November 19, 2015 after last Friday's series of deadly attacks in the French capital. REUTERS/Philippe Wojazer ATTENTION EDITORS FRENCH LAW REQUIRES THAT FACES SPECIAL INTERVENTION POLICE FORCES ARE MASKED IN PUBLICATIONS WITHIN FRANCE 

French police sharp shooters secure a ceremony attended by the French President in the courtyard of the Hotel des Invalides in Paris, France, November 19, 2015 after last Friday's series of deadly attacks in the French capital. REUTERS/Philippe Wojazer ATTENTION EDITORS FRENCH LAW REQUIRES THAT FACES SPECIAL INTERVENTION POLICE FORCES ARE MASKED IN PUBLICATIONS WITHIN FRANCE 

French police sharp shooters secure a ceremony attended by French President in the courtyard of the Hotel des Invalides in Paris, France, November 19, 2015 after last Friday's series of deadly attacks in the French capital. REUTERS/Philippe Wojazer ATTENTION EDITORS FRENCH LAW REQUIRES THAT FACES SPECIAL INTERVENTION POLICE FORCES ARE MASKED IN PUBLICATIONS WITHIN FRANCE 

French police sharp shooters secure a ceremony attended by French President in the courtyard of the Hotel des Invalides in Paris, France, November 19, 2015 after last Friday's series of deadly attacks in the French capital. REUTERS/Philippe Wojazer ATTENTION EDITORS FRENCH LAW REQUIRES THAT FACES SPECIAL INTERVENTION POLICE FORCES ARE MASKED IN PUBLICATIONS WITHIN FRANCE 

French police sharp shooters secure a ceremony attended by French President in the courtyard of the Hotel des Invalides in Paris, France, November 19, 2015 after last Friday's series of deadly attacks in the French capital. REUTERS/Philippe Wojazer TPX IMAGES OF THE DAY ATTENTION EDITORS FRENCH LAW REQUIRES THAT FACES SPECIAL INTERVENTION POLICE FORCES ARE MASKED IN PUBLICATIONS WITHIN FRANCE 

A Palestinian gunman walks inside the Ain al-Hilweh Palestinian refugee camp during clashes between Palestinian Fatah gunmen and militants of Islamist group Jund al-Sham in the area, near the port-city of Sidon, southern Lebanon August 23, 2015. Palestinian factions have agreed on Sunday to a cease-fire between the Fatah Movement and Jund al-Sham, local media reported. REUTERS/Ali Hashisho

An ambulance leaves the Ain al-Hilweh Palestinian refugee camp, as a Palestinian Fatah gunman fires his weapon at militants of Islamist group Jund al-Sham near the port-city of Sidon, southern Lebanon August 23, 2015. Palestinian factions have agreed on Sunday to a cease-fire between the Fatah Movement and Jund al-Sham, local media reported. REUTERS/Ali Hashisho

A Lebanese army soldier mans a checkpoint at an entrance to the Ain al-Hilweh Palestinian refugee camp, as Palestinian Fatah gunmen fire their weapons at militants of Islamist group Jund al-Sham near the port-city of Sidon, southern Lebanon August 23, 2015. Palestinian factions have agreed on Sunday to a cease-fire between the Fatah Movement and Jund al-Sham, local media reported. REUTERS/Ali Hashisho REUTERS/Ali Hashisho 

A medic stands near a Lebanese army soldier manning a checkpoint at an entrance to the Ain al-Hilweh Palestinian refugee camp, as Palestinian Fatah gunmen fire their weapons at militants of Islamist group Jund al-Sham near the port-city of Sidon, southern Lebanon August 23, 2015. Palestinian factions have agreed on Sunday to a cease-fire between the Fatah Movement and Jund al-Sham, local media reported. REUTERS/Ali Hashisho REUTERS/Ali Hashisho TPX IMAGES OF THE DAY

A man fires a weapon as he dances during a traditional excursion near the western Saudi city of Taif, August 8, 2015. Saudis usually party in such excursions as they celebrate weddings or graduations. REUTERS/Mohamed Al Hwaity TPX IMAGES OF THE DAY
FOR BEST QUALITY IMAGE ALSO SEE: GF10000171403 

Emergency vehicles and personnel fill the parking lot outside of a Nashville-area theater where a gunman wearing a surgical mask opened fire at a showing of the movie "Mad Max: Fury Road" in Nashville, Tennessee August 5, 2015. The gunman was fatally shot by police and three people in the theater suffered minor injuries after the suspect sprayed a substance thought to be pepper spray. REUTERS/Tim Ghianni 

Emergency workers gather outside of a Nashville-area theater where a gunman wearing a surgical mask opened fire at a showing of the movie "Mad Max: Fury Road" in Nashville, Tennessee August 5, 2015. The gunman was fatally shot by police and three people in the theater suffered minor injuries after the suspect sprayed a substance thought to be pepper spray. REUTERS/Tim Ghianni 

Emergency workers gather outside of a Nashville-area theater where a gunman wearing a surgical mask opened fire at a showing of the movie "Mad Max: Fury Road" in Nashville, Tennessee August 5, 2015. The gunman was fatally shot by police and three people in the theater suffered minor injuries after the suspect sprayed a substance thought to be pepper spray. REUTERS/Tim Ghianni 

The suspect held over an attack against a gas company site is escorted by police officers during investigations in Saint-Priest, near Lyon, France, June 28, 2015. Yassin Salhi, 35, told detectives he had killed Herve Cornara in a parking area before arriving at the plant in Saint Quentin-Fallavier, 30 km (20 miles) south of Lyon, where he attempted to cause an explosion on Friday, the source told Reuters. REUTERS/Emmanuel Foudrot 

A tourist places flowers at the beachside of the Imperiale Marhabada hotel, which was attacked by a gunman in Sousse, Tunisia, June 27, 2015. Tour companies were evacuating thousands of foreign holidaymakers from Tunisia on Saturday, a day after a gunman killed 39 people as they lounged at the beach in an attack claimed by Islamic State. Tunisia's Prime Minister Habib Essid said most of the dead were British, and its health ministry said eight Britons, a German, a Belgian and an Irish citizen were among the casualties of the attack at a hotel in the resort town of Sousse. REUTERS/Zoubeir Souissi TPX IMAGES OF THE DAY

Paris prosecutor Francois Molins (R) and Christian Flaesch (L), director of the Paris' judiciary police, show two photographs of the suspect gunman taken from surveillance footage during a news conference in Paris November 18, 2013. Police were hunting a lone gunman on the loose in central Paris on Monday after he opened fire at the offices of left-wing daily newspaper Liberation and a major bank before hijacking a car to take him to the Champs-Elysees avenue. The shaven-haired assailant, who police said was filmed by video-surveillance cameras, fired shots at the office of Liberation daily, seriously injuring a photographer's assistant before fleeing, police and staff at the newspaper said. REUTERS/Gonzalo Fuentes (FRANCE - Tags: CRIME LAW MEDIA) 

A Sunni Muslim gunman fires his weapon expressing his support with Salafist leader Ahmad al-Assir in Tripoli, northern Lebanon, June 23, 2013. At least three Lebanese soldiers were killed in the coastal city of Sidon on Sunday in clashes with followers of a Sunni Islamist cleric who is a fierce critic of Hezbollah's military intervention in neighbouring Syria, a security official said. Sources in the city said the fighting broke out when a follower of Sheikh Ahmed al-Assir was arrested at an army roadblock in Sidon, 40 km (28 miles) south of Beirut. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST) 

A Sunni Muslim gunman, wearing a mask, fires his weapon in front of burning tires, in solidarity with Salafist leader Ahmad al-Assir in Tripoli, northern Lebanon, June 23, 2013. At least three Lebanese soldiers were killed in the coastal city of Sidon on Sunday in clashes with followers of a Sunni Islamist cleric who is a fierce critic of Hezbollah's military intervention in neighbouring Syria, a security official said. Sources in the city said the fighting broke out when a follower of Sheikh Ahmed al-Assir was arrested at an army roadblock in Sidon, 40 km (28 miles) south of Beirut. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A man is detained by police and local security after shooting on the sidelines of the Cannes Film Festival near the Grand Journal de Canal+ television studio set on the Croisette in Cannes May 17, 2013. The man was arrested at the Cannes film festival on Friday after firing a starting pistol during a live TV broadcast on the palm-lined waterfront, sending actors Christoph Waltz and Daniel Auteuil running for cover. REUTERS/Nathan Gourdol (FRANCE - Tags: ENTERTAINMENT CRIME LAW TPX IMAGES OF THE DAY) 

Sunni Muslim gunmen climb a ladder to take cover during sectarian clashes between Sunni Muslims and Alawites in the Bab al-Tebbaneh neighbourhood in Tripoli, northern Lebanon, August 24, 2012. Sectarian violence flared in Lebanon's port city of Tripoli after a short ceasefire, with at least 13 dead in the ongoing violence. REUTERS/Omar Ibrahim (LEBANON - Tags: CIVIL UNREST) 

Sunni Muslim gunmen aim their rifles from the Sunni Muslim-dominant neighbourhood of Bab al-Tebbaneh in Tripoli, northern Lebanon, during clashes between Sunni Muslims and Alawites August 22, 2012. The death toll from fighting between Sunni Muslims and Alawites in Tripoli climbed to at least 10 overnight, medical sources said on Wednesday, in clashes that the city's residents described as some of the heaviest since Lebanon's civil war. REUTERS/Stringer (LEBANON - Tags: POLITICS CIVIL UNREST) 

A Lebanese Sunni Muslim gunman points his rifle as other takes up position at the Sunni Muslim dominant neighbourhood of Bab al-Tebbaneh in Tripoli, northern Lebanon, during clashes between Sunni Muslims and Alawites August 22, 2012. The death toll from fighting between Sunni Muslims and Alawites in Tripoli climbed to at least 10 overnight, medical sources said on Wednesday, in clashes that the city's residents described as some of the heaviest since Lebanon's civil war. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A Sunni Muslim gunman takes position behind sandbags at the Sunni Muslim dominant Bab al-Tebbaneh neighbourhood in Tripoli, northern Lebanon, during clashes with Alawites, August 21, 2012 . One person was killed and several dozen wounded in clashes between Sunni Muslims and Alawites in Lebanon's northern city of Tripoli in another spillover from the war in neighbouring Syria, security and medical sources said on Tuesday. Chronic Sunni-Alawite tensions in Tripoli have been heightened by the 17-month-old, mainly Sunni, uprising in Syria against President Bashar al-Assad, an Alawite. REUTERS/Stringer (LEBANON - Tags: POLITICS CIVIL UNREST MILITARY) 

A Lebanese Sunni gunman (R) is injured by gunfire while trying to fire a rocket towards the Jabal Mohsen district, home to the minority Alawite sect, during clashes in Lebanon's northern port city of Tripoli, June 2, 2012. Clashes erupted between supporters and opponents of Syrian President Bashar al-Assad in neighbouring Lebanon's northern port city of Tripoli on Saturday, killing eight people and wounding 40, residents and a doctor said. REUTERS/Omar Ibrahim (LEBANON - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A Sunni Muslim gunman fires during clashes at the Sunni Muslim Bab al-Tebbaneh neighbourhood in Tripoli, northern Lebanon, May 13, 2012. Three people were killed when fighting erupted overnight in the Lebanese city of Tripoli between members of the Alawite minority loyal to Syrian President Bashar al-Assad and members of the Sunni majority, witnesses and security officials said on Sunday. REUTERS/Stringer (LEBANON - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) 

A gunman (C) with an automatic weapon, lies on a street after being overwhelmed after he fired shots at the U.S. Embassy, in Sarajevo October 28, 2011. The gunman opened fire at the United States embassy in the Bosnian capital Sarajevo on Friday and police rushed to the scene, a Reuters witness said. A Reuters photographer said police were trying to surround the gunman, who was armed with a Kalashnikov rifle. REUTERS/Danilo Krstanovic (BOSNIA AND HERZEGOVINA - Tags: POLITICS CRIME LAW CIVIL UNREST TPX IMAGES OF THE DAY) 

A gunman with an automatic weapon walks in Sarajevo, after he fired shots at the U.S. embassy, October 28, 2011. The gunman with an automatic weapon opened fire at the United States embassy in the Bosnian capital Sarajevo on Friday and police rushed to the scene, a Reuters witness said. A Reuters photographer said police were trying to surround the gunman, who was armed with a Kalashnikov rifle. REUTERS/Dado Ruvic (BOSNIA AND HERZEGOVINA - Tags: CRIME LAW TPX IMAGES OF THE DAY)