Gunmen have killed nine Mexican police officers and wounded another in an ambush in Guerrero, a southwestern state beset by drug violence, prosecutors said Wednesday. The Guerrero prosecutor's office announced on its Facebook page "the death of nine state police officers killed in the line of duty." The attack took place in the town of Apaxtla de Castrejon, which is located in a region known as "Tierra Caliente" ("Hot Land") that has been the scene of brutal gang turf wars.