A spent bullet shell casing is pictured near the facade of the bullet-riddled town hall of Villa Union, days after a gun battle between police and hitmen, in the municipality of Villa Union, Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A sculpture of Jesus Christ is seen in an office of the bullet-riddled town hall of Villa Union, days after a gun battle between police and hitmen, in the municipality of Villa Union, Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

State police officers patrol the streets, days after a gun battle between police and hitmen, in the municipality of Villa Union, Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

Pictures of former mayors left with bullet impacts are seen in the bullet-riddled town hall of Villa Union, days after a gun battle between police and hitmen, in the municipality of Villa Union, Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril TPX IMAGES OF THE DAY

A bullet hole is seen near a sculpture of Jesus Christ inside the bullet-riddled town hall of Villa Union, days after a gun battle between police and hitmen, in the municipality of Villa Union, Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A man is pictured through a bullet-riddled glass of a store, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A woman is pictured through a bullet-riddled glass of a store, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer stands guard near to a bullet-riddled house, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

Military police officers are pictured through a glass with a bullet hole, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer stands guard near to a bullet-riddled school bus, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer stands guard near to a bullet-riddled school bus, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A bullet-riddled school bus is seen days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer stands guard near to a bullet-riddled school bus, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

Members of the Mexican National Guard patrol near to the bullet-riddled building of the town hall of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

Members of the Mexican National Guard guard the bullet-riddled building of the town hall of Villa Union, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer walks past near to a bullet-riddled and burnt police vehicle, days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A bullet-riddled and burnt police vehicle is seen at town hall of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A man is pictured near the bullet-riddled town hall building of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer is pictured near the bullet-riddled town hall building of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A view shows the bullet-riddled facade of the town hall of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer walks near the bullet-riddled facade of the town hall of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

A military police officer stands guard near the bullet-riddled facade of the town hall of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

The bullet-riddled facade of the town hall of Villa Union is seen days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

The bullet-riddled facade of the town hall of Villa Union is seen days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

Military police officers stand guard near the bullet-riddled facade of the town hall of Villa Union days after a gun battle between police and hitmen, in the municipality of Villa Union, state of Coahuila, Mexico December 2, 2019. REUTERS/Daniel Becerril

Police officers push the coffin of one of their fellow police officers, who was killed during an ambush by suspected cartel hitmen, during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Police officers push the coffin of one of their fellow police officers, who was killed during an ambush by suspected cartel hitmen, during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, react during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, attend an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, react during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, carry his framed photo during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, react during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, react during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Relatives of a police officer, who was killed along other fellow police officers during an ambush by suspected cartel hitmen, react during an homage organised by the state government, in Morelia, in Michoacan state, Mexico October 15, 2019. REUTERS/Alan Ortega

Security forces patrol along a road after police officers were killed during an ambush by suspected cartel hitmen in El Aguaje, in Michoacan state, Mexico October 14, 2019. REUTERS/Alan Ortega

Police officers patrol at a road after fellow police officers were killed during an ambush by suspected cartel hitmen in El Aguaje, in Michoacan state, Mexico October 14, 2019. REUTERS/Alan Ortega

Security forces patrol along a road after police officers were killed during an ambush by suspected cartel hitmen in El Aguaje, in Michoacan state, Mexico October 14, 2019. REUTERS/Alan Ortega

A soldier assigned to the National Guard keeps watch at a road after police officers were killed during an ambush by suspected cartel hitmen in El Aguaje, in Michoacan state, Mexico October 14, 2019. REUTERS/Alan Ortega

Security forces patrol along a road after police officers were killed during an ambush by suspected cartel hitmen in El Aguaje, in Michoacan state, Mexico October 14, 2019. REUTERS/Alan Ortega

Police officers are presented to the media after being detained under charges of homicide in San Salvador, El Salvador, September 30, 2019. 11 officers of the National Civil Police of El Salvador were captured for being part of a group of hitmen dedicated to murder gang members, according to the prosecutor general and police chiefs. REUTERS/Jose Cabezas

A police officer walks to be presented to the media after being detained under charges of homicide in San Salvador, El Salvador, September 30, 2019. 11 officers of the National Civil Police of El Salvador were captured for being part of a group of hitmen dedicated to murder gang members, according to the prosecutor general and police chiefs. REUTERS/Jose Cabezas

Police chiefs stand in front of police officers presented to the media after being detained under charges of homicide in San Salvador, El Salvador, September 30, 2019. 11 officers of the National Civil Police of El Salvador were captured for being part of a group of hitmen dedicated to murder gang members, according to the prosecutor general and police chiefs. REUTERS/Jose Cabezas

Police officers cover their faces as they are presented to the media after being detained under charges of homicide in San Salvador, El Salvador, September 30, 2019. 11 officers of the National Civil Police of El Salvador were captured for being part of a group of hitmen dedicated to murder gang members, according to the prosecutor general and police chiefs. REUTERS/Jose Cabezas

Police officers cover their faces as they are presented to the media after being detained under charges of homicide in San Salvador, El Salvador, September 30, 2019. 11 officers of the National Civil Police of El Salvador were captured for being part of a group of hitmen dedicated to murder gang members, according to the prosecutor general and police chiefs. REUTERS/Jose Cabezas

A police officer walks to be presented to the media after being detained under charges of homicide in San Salvador, El Salvador, September 30, 2019. 11 officers of the National Civil Police of El Salvador were captured for being part of a group of hitmen dedicated to murder gang members, according to the prosecutor general and police chiefs. REUTERS/Jose Cabezas

A policeman is seen at a crime scene following an attack on municipal police officers by drug hitmen, according to local media, in Ciudad Juarez, Mexico December 13, 2018. REUTERS/Jose Luis Gonzalez

Policemen are seen at a crime scene following an attack on municipal police officers by drug hitmen, according to local media, in Ciudad Juarez, Mexico December 13, 2018. REUTERS/Jose Luis Gonzalez

Policemen are seen at a crime scene following an attack on municipal police officers by drug hitmen, according to local media, in Ciudad Juarez, Mexico December 13, 2018. REUTERS/Jose Luis Gonzalez

Policemen are seen at a crime scene following an attack on municipal police officers by drug hitmen, according to local media, in Ciudad Juarez, Mexico December 13, 2018. REUTERS/Jose Luis Gonzalez

Police cordons are seen outside in a restaurant where at least five people were killed and two injured in a gunfight between police and hitmen in the Mexican beach resort of Cancun on Friday, Mexico July 28, 2018. REUTERS/Israel Leal

Police cordons are seen outside a restaurant where at least five people were killed and two injured in a gunfight between police and hitmen in the Mexican beach resort of Cancun on Friday, Mexico July 28, 2018. REUTERS/Israel Leal

Soldiers stand guard at a crime scene after a man was shot dead by unknown hitmen, according to local media, in downtown Acapulco, Mexico May 6, 2018. REUTERS/Javier Verdin

An injured man is seen inside an ambulance after a shoot out between the police and hitmen, where three men were wounded and one dead according to the local police, in Ciudad Juarez, Mexico February 9, 2018. Picture taken February 9, 2018. REUTERS/Jose Luis Gonzalez

A forensic officer investigates the area after a shoot out between the police and hitmen, where three men were wounded and one dead according to the local police, in Ciudad Juarez, Mexico February 9, 2018. Picture taken February 9, 2018. REUTERS/Jose Luis Gonzalez

Police officers guard the area after a shoot out between the police and hitmen, where three men were wounded and one dead according to the local police, in Ciudad Juarez, Mexico February 9, 2018. Picture taken February 9, 2018. REUTERS/Jose Luis Gonzalez

A police officer guards the area after a shoot out between the police and hitmen, where three men were wounded and one dead according to the local police, in Ciudad Juarez, Mexico February 9, 2018. Picture taken February 9, 2018. REUTERS/Jose Luis Gonzalez

Police officer guard the area after a shoot out between the police and hitmen, where three men were wounded and one dead according to the local police, in Ciudad Juarez, Mexico February 9, 2018. Picture taken February 9, 2018. REUTERS/Jose Luis Gonzalez

A bullet-riddled SUV is seen at a crime scene as a police investigator looks for evidence after a shooting between rival gangs in the Valley of Juarez, on the outskirts of Ciudad Juarez, May 28, 2015. A shootout between rival hitmen erupted early Friday in the community of Praxedis Guerrero, but no casualties were reported, according to local media. REUTERS/Jose Luis Gonzalez