The bodies of three state police officers, one of whom had been decapitated, were found Saturday in a sport utility vehicle abandoned outside the Pacific resort city of Acapulco, police said.

The two commanders and an agent with Guerrero's Ministerial Investigative Police were kidnapped Friday in Chilpancingo, the state capital. Their remains were found the next morning in a Nissan X-Trail with tinted windows abandoned near a highway linking Acapulco and Mexico City, 180 miles to the north, said Jorge Valdez, a spokesman for the state public safety secretary.

One commander, identified as Isaac Nava, was decapitated and his head recovered inside a black plastic bag in Chilpancingo, 60 miles north of Acapulco. Another victim was wrapped in a blanket and the third had colored tape covering his face, Valdez said.

Valdez said revenge may have motivated the killings, saying Nava was involved in a recent operation in downtown Acapulco during which two suspected drug smugglers were captured.

No arrests were made.

Acapulco has been besieged for months by a wave of beheadings, shootings, stabbings and grenade attacks on police stations. Criminals have left the decapitated heads of at least six victims in front of government offices with threatening notes attached.

Authorities say the violence is part of a turf war between drug traffickers over shipment routes. In the last few months, police have found more than a dozen decapitation victims in the states of Guerrero, Michoacan and Baja California as well as in the northern city of Monterrey.