Mexican authorities say police have found the bodies of four people killed in apparent drug violence, three of them decapitated.

A Mexico state prosecutor's official says three decapitated bodies and a severed head were discovered Thursday in two different parts of the state. The official declined to be identified in accordance with department policy.

A fourth body was found at a ranch in the western state of Michoacan.

And a second severed head turned up in a plastic bag in the southern state of Guerrero. It was not clear whether either head belonged to any of the decapitated victims in Mexico state.

Mexico's powerful cartels often decapitate their victims. Drug violence has cost more than 10,800 lives since late 2006.