Authorities believe that Germán Reyes, a former prosecutor in Guerrero, worked in collusion with one of the two main gangs in the state to commit the crime

Germán Reyes was arrested on charges of homicide for the killing of Alejandro Arcos just a week after he took office as mayor, officials said.

Mexican law enforcement announced on Tuesday the arrest of a top municipal security official for the assassination of the mayor of the capital of the violence-plagued state of Guerrero. The murder and decapitation of Chilpancingo Mayor Alejandro Arcos shocked the country,