A Brazilian soldier patrols the Alemao complex slum during an operation against drug dealers in Rio de Janeiro, Brazil August 21, 2018. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY 

A Brazilian soldier patrols the Alemao complex slum during an operation against drug dealers in Rio de Janeiro, Brazil August 21, 2018. REUTERS/Ricardo Moraes 

A police officer tries to extinguish a fire set by demonstrators during a protest against the death of alleged drug dealers during an operation against drug gangs in Cidade de Deus slum in Rio de Janeiro, Brazil May 3, 2018. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY 

A police officer tries to extinguish a fire set by demonstrators during a protest against the death of alleged drug dealers during an operation against drug gangs in Cidade de Deus slum in Rio de Janeiro, Brazil May 3, 2018. REUTERS/Ricardo Moraes TPX IMAGES OF THE DAY 

A gun is pictured as armed forces members patrol during an operation against drug dealers in Vila Kennedy slum, in Rio de Janeiro, Brazil February 23, 2018. REUTERS/Ricardo Moraes 

Bullets are pictured on a machine gun as armed forces members patrol during an operation against drug dealers in Vila Kennedy slum, in Rio de Janeiro, Brazil February 23, 2018. REUTERS/Ricardo Moraes 

A weapons dealer cleans his AK-47 assault rifle at his house in Laghman province, December 10, 2012. Arms purchases are soaring in Afghanistan, along with the price of weapons, a sign that many Afghans fear a return of the Taliban, civil war or rising lawlessness. Picture taken December 10, 2012. To match Insight AFGHANISTAN-GUNS/ REUTERS/Parwiz (AFGHANISTAN - Tags: CONFLICT SOCIETY BUSINESS) 

Illegal arms are seen during a public destruction of confiscated weapons in the western state of Lara, about 350 km (217 miles) from Caracas November 30, 2012. REUTERS/Carlos Garcia Rawlins (VENEZUELA - Tags: CRIME LAW POLITICS) 

Brazilian Navy soldiers patrol in an armoured vehicle during an operation against drug dealers at Mangueira slum in Rio de Janeiro June 19, 2011. Rio de Janeiro's security forces started a big operation in Mangueira slum to base a peacekeeping unit near Maracana Stadium. It is the last favela, located near Maracana Stadium, which was introduced to the peace program to ensure the security of the 2014 World Cup. REUTERS/Ricardo Moraes (BRAZIL - Tags: CIVIL UNREST CRIME LAW SOCIETY MILITARY) 

Confiscated weapons are shown at the military zone of Mexico City May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: SOCIETY CRIME LAW) 

Confiscated weapons are shown at the military zone of Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: SOCIETY CRIME LAW) 

AK-47 rifles with gold parts are seen at the military zone of Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: SOCIETY CRIME LAW) 

A military personnel is checked by a soldier at the exit of the deposit of weapons seized by the Mexican army, at the military zone of Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: MILITARY CRIME LAW SOCIETY) 

A Mexican soldier shows a .22 caliber mini revolver at the military zone in Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: SOCIETY CRIME LAW MILITARY) 

A Mexican soldier shows a Rocket-Propelled Grenade (RPG) Launcher at the military zone of Mexico City May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: SOCIETY CRIME LAW MILITARY) 

A AK-47 rifle with gold parts is shown at the military zone of Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY) 

A Mexican soldier holds a AK-47 with gold parts and wooden carving at the military zone of Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: CRIME LAW SOCIETY) 

A Mexican soldier shows a seized gun with gold and diamond details at the military zone of Mexico City, May 6, 2011. Guns belonging to drug gangs that have been modified may be retained for analysis while those inlaid with gold and expensive carvings often end up in exhibitions. Brigadier General Antonio Erasto Monsivais, the general in charge of decommissioning weapons seized from drug dealers, estimated around 70-80 percent of all arms seized were melted down and turned into everything from industrial hardware to sculptures. Usable weapons that conform with military regulations are sometimes given to the army. REUTERS/Jorge Dan Lopez (MEXICO - Tags: SOCIETY CRIME LAW) 

Policemen check a house during an operation against drug dealers in Rocinha slum in Rio de Janeiro April 19, 2011. About 3 tons of marijuana were seized and seven people arrested during the operation, according to local media. REUTERS/Sergio Moraes (BRAZIL - Tags: CIVIL UNREST CRIME LAW SOCIETY) 

Passengers in a bus look at a policeman aiming his weapon as he travels at the back of a police pickup truck with slabs of marijuana seized during an operation against drug dealers in Rocinha slum in Rio de Janeiro April 19, 2011. About 3 tons of marijuana were seized and seven people arrested during the operation, local media said. REUTERS/Ricardo Moraes (BRAZIL - Tags: CIVIL UNREST CRIME LAW SOCIETY) 

A policeman aims his weapon as he travels at the back of a police pickup truck with slabs of marijuana seized during an operation against drug dealers in Rocinha slum in Rio de Janeiro April 19, 2011. About 3 tons of marijuana were seized and seven people arrested during the operation, local media said. REUTERS/Ricardo Moraes (BRAZIL - Tags: CIVIL UNREST CRIME LAW SOCIETY IMAGES OF THE DAY) 

Firearms and ammunition are seen on display at an arms market in Maarib city, around 190 km (118 miles) east of the Yemeni capital Sanaa October 14, 2010. Yemen's gun culture is ingrained. As well as wearing curved daggers at their waist, it is not unusual for Yemeni men to carry AK-47 assault rifles, hunting rifles and pistols. Yemen is known for its spiralling political violence. This year the country has seen bloody rampages by al Qaeda militants, another round of conflict with northern Shi'ite rebels and rising brutality in the secessionist south. Picture taken October 14, 2010. To match Feature YEMEN-ARMS REUTERS/Khaled Abdullah (YEMEN - Tags: CIVIL UNREST SOCIETY) 

Arms vendors wait for customers at their shop in Maarib City, around 190 km (118 miles) east of the Yemeni capital Sanaa October 14, 2010. Yemen's gun culture is ingrained. As well as wearing curved daggers at their waist, it is not unusual for Yemeni men to carry AK-47 assault rifles, hunting rifles and pistols. Yemen is known for its spiralling political violence. This year the country has seen bloody rampages by al Qaeda militants, another round of conflict with northern Shi'ite rebels and rising brutality in the secessionist south. Picture taken October 14, 2010. To match Feature YEMEN-ARMS REUTERS/Khaled Abdullah (YEMEN - Tags: CIVIL UNREST SOCIETY POLITICS) 

Police arrest a suspected drug dealer during an operation at Alemao slum in Rio de Janeiro November 28, 2010. Police and troops occupied the Rio de Janeiro slum on Sunday and were conducting a house-to-house search for drug traffickers behind a crime wave in the beachside city last week that killed at least 46. REUTERS/Bruno Domingos (BRAZIL - Tags: CIVIL UNREST CRIME LAW SOCIETY) 

MEXICO-DRUGS/ - Factbox with portrait of Mexican Arturo Beltran Leyva, one of Mexico's most wanted drug traffickers who was killed in a gun battle on Wednesday. RNGS (SIN02) 

MEXICO-DRUGS/ - Factbox with portrait of Mexican Arturo Beltran Leyva, one of Mexico's most wanted drug traffickers who was killed in a gun battle on Wednesday. RNGS (SIN02) 

Journalists take cover during a police operation against drug dealers in the Vila Cruzeiro slum in Rio de Janeiro October 23, 2009. Up till Wednesday, thirty-three people have died since violence between rival gangs of drug traffickers erupted in Rio at the weekend. The city was awarded the 2016 Olympics two weeks earlier following a campaign that played down security problems and portrayed a joyful city of beaches and Carnival celebrations. REUTERS/Ricardo Moraes (BRAZIL POLITICS CONFLICT CRIME LAW) 

Soldiers display sub machines guns seized to suspected drug boss Omar Ibarra Lozano, 25, at a military base on the outskirts of Monterrey, northern Mexico June 27, 2009. Lozano, a former top state policeman that has been operating for a month as the new boss of the Beltran Leyva Cartel in the wealthy neighbourhood of San Pedro, was detained on Friday along with a drug dealer, local media said. The army also seized weapons, drugs and a list of 33 policemen presumed to be in collusion with organised crime. REUTERS/Tomas Bravo (MEXICO CRIME LAW CONFLICT SOCIETY MILITARY) 

A Brazilian policeman arrests a suspected drug trafficker during an anti-narcotics raid in the Rocinha shantytown of Rio de Janeiro March 25, 2009. Acting on information that local drug bandits were planning to invade another nearby slum, over 200 police officers raided Rocinha, one of the largest slums in Latin America with around 200,000 residents, killing three suspected bandits and confiscating a cocaine laboratory along with one ton of marijuana. REUTERS/Bruno Domingos (BRAZIL CONFLICT SOCIETY IMAGE OF THE DAY TOP PICTURE) 

Mexican federal police present the members of a detained drug trafficking gang during a news conference in Mexico City October 19, 2008. The gang was detained on October 18, 2008 in Alvaro Obregon district in Mexico City. Out of the fifteen people who were arrested, ten are Colombians, according to the police. REUTERS/Daniel Aguilar (MEXICO) 

Suspected Colombian drug trafficker Jorge Serna, also known as "Kener", is escorted by National Police in Bogota July 18, 2008. Colombian authorities captured Serna in Copacabana, near Medellin. REUTERS/John Vizcaino (COLOMBIA) 

The body of drug lord Victor Manuel Mejia lies on the floor at the farm where he was killed by police in Taraza, Colombia, April 29, 2008. Police killed Victor Mejia, a drug lord known as one of the "twins" who controlled Colombia's biggest emerging cocaine gang staffed by former right-wing militia fighters in a shootout on Tuesday. Picture taken April 29, 2008. REUTERS/Policia (COLOMBIA). FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. 

An AK47 rifle (L) and an American AR15 rifle confiscated by the Bureau of Alcohol Tobacco and Firearms (ATF) stand against a car door pierced by their rounds during a demonstration by the ATF of the firepower of weapons commonly used by criminals along the U.S.-Mexican border at the Ben Avery Shooting Range in Phoenix, Arizona, March 10, 2008. Picture taken March 10, 2008. This photo accompanies the WITNESS/GUNRUNNERS piece by Reuters journalist Tim Gaynor as he tells how he traced a Kalashnikov rifle bought in Arizona to a mining town in Mexico where it was used by a drug gang in a battle with police and troops that killed 23 people. REUTERS/Rick Scuteri (UNITED STATES) 

Palestinian weapons dealers display arms in the West Bank city of Hebron September 20, 2007. Four months after Islamist Hamas routed secular Fatah in the Gaza Strip, fears that clashes between the Palestinian rivals could erupt in the West Bank and uncertainty ahead of a U.S.-led peace conference are fuelling a scramble for guns. Dealers at the gun market in Hebron say weapons sales have jumped by up to 70 percent since Hamas took control of Gaza, while buoyant demand and supply bottlenecks due to tighter security have inflated prices. Picture taken September 20, 2007. To match feature PALESTINIANS-GUNS/ REUTERS/Nayef Hashlamoun (WEST BANK) 

New York City Mayor Michael Bloomburg (L) speaks to reporters along with New York Senator Charles Schumer (D-NY) on Capitol Hill in Washington May 16, 2006. Bloomberg and Schumer announced a bill to allow localities to use federal data to trace guns used in crimes on their streets. The intent of the bill is to shut down and prosecute rogue gun dealers who supply guns for illegal activity. REUTERS/Kevin Lamarque 

U.S. President Bill Clinton announces regulatory actions that the Bureau of Alcohol, Tobacco and Firearms will take to bolster enforcement efforts to help prevent the diversion of guns from dealers to the hands of criminals during a statement at the White House, February 4. Listening to the president is U.S. Treasury Secretary Lawrence Summers (L) and Director of the ATF Bradley Buckles.

LSD/JP 

U.S. President Bill Clinton announces regulatory actions that the Bureau of Alcohol, Tobacco and Firearms will take to bolster enforcement efforts to help prevent the diversion of guns from dealers to the hands of criminals during a statement at the White House, February 4. Listening to the president is U.S. Treasury Secretary Lawrence Summers.

LSD/JP/ME 

Gun dealer Mel Bernstein holds an M-60 machine gun in his gun shop outside Colorado Springs April 27. Bernstein alerted federal authorities that school shooting suspects Dylan Klebold and Eric Harris, along with two other people dressed in black trench coats, attempted to purchase a machine gun several weeks before the April 20 shooting rampage at Columbine High School. 

The "Macama", a bar on the Hyeres sea-front, known as a haven for drug dealers and addicts, in southern France June 18. Two men, belonging to a small-time underworld group based at the "Macama", were arrested for alledgedly taking part in the assassination of French parliamentarian Yann Piat, a right-wing crusader against drugs and organised crime gunned down in her Riviera constituency in February 

The "Macama", a bar on the Hyeres sea-front, known as a haven for drug dealers and addicts, in southern France June 18. Two men, belonging to a small-time underworld group based at the "Macama", were arrested for alledgedly taking part in the assassination of French parliamentarian Yann Piat, a right-wing crusader against drugs and organised crime gunned down in her Riviera constituency in February