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Also Friday, the top prosecutor in the western state of Jalisco, Eduardo Almaguer, said authorities discovered two drug cartel training camps where they believe about 40 people had been trapped and trained after being tricked by online job advertisements. An unknown number of human remains were also found.

The victims were apparently lured by job offers for private security guards or municipal police and were then forced to build their own shelters from wood and branches and train in tactics and shooting — using paintball guns — while under guard by gang members, Almaguer said. The investigation that led to the camps started with six similar reports of missing people in June.

“They are recruiting good people who look for employment,” Almaguer said.

On Thursday, a neighbourhood on the south side of Mexico City exploded in gunfire and eight people were killed as marines tried to capture the leader of a drug gang that controlled street-level drug sales in part of the city. The gang’s semi-automatic rifles and burning vehicle barriers set up to block authorities were reminiscent of perennial hotspots like the border city of Reynosa, but almost unheard of in the capital.

Those events underscore the growing struggles between or against organized crime groups from one end of the country to the other.

Murders remain high in states that have traditionally struggled with violence like Guerrero and Mexico state. But they have also shot up in states unaccustomed to such bloodshed, like Baja California Sur — home to the Los Cabos tourist resorts — and the Pacific coast state of Colima.

The border state of Chihuahua, which had found some relief from violence that peaked in 2010, has found its murders in 2017 running about 55 per cent ahead of where they were last year.