MEXICO CITY, May 4 (UPI) -- Five decapitated bodies were found outside Mexico City with messages attributing their deaths to score-settling between criminal gangs, officials said.
Mexican state police discovered the bodies in the backseat of a BMW, their heads placed on the windshield, in the city of Cuautitlan Izcalli, El Universal reported.
A message was left with the bodies indicating the incident was committed by an organized crime group.
State prosecutors are conducting an investigation.
Another body was found in a trash bag in the La Mora district of the neighboring city of Naucalpan, where another message stated the murder was carried out by the Centro cartel.
About 40,000 people have been killed in Mexico since December 2006, when President Felipe Calderon declared war on the country's cartels.