Updated

Gunmen have killed the presiding lawmaker of the state legislature in a drug-plagued Mexican state, in what is the latest violence in Mexico's raging war on drugs.

Guerrero state's public safety department says the body of leftist congressman Armando Chavarria was found early Thursday in the passenger seat of a vehicle in the state capital of Chilpancingo.

The report says Chavarria suffered three gunshot wounds.

Chavarria belonged to the Democratic Revolution Party. Police say they have not made arrests or determined a motive.

Guerrero is a hotbed for drug violence.

State police say three human heads were found Thursday in ice boxes in the municipality of Coyuca de Catalan. The mutilated bodies were in bags nearby. A message from alleged drug traffickers was also found.