MEXICO CITY (AP) — Three Mexican soldiers were killed and three others wounded in an ambush in the southern state of Guerrero, the army said Wednesday.

In a statement, the army said the attack occurred Tuesday in the township of Coyuca de Catalan as soldiers responded to an anonymous report about armed men in the area.

Also Tuesday, state authorities found the body of the same township's mayor between Coyuca de Catalan and Ciudad Altamirano. He had taken leave to run for the state legislature. There was no initial indication that the incidents were connected.

The area near the border with Michoacan state has long been one of Mexico's most violent due to the opium poppy growing operations and the drug gangs that operate there.

Also Wednesday, federal prosecutors announced they had arrested a main suspect in the 2010 killing of Silverio Cavazos, the former governor of the Pacific coast state of Colima.

Prosecutors said the suspect, Gerardo Mendoza Chavez, was arrested Wednesday, and described him as the "mastermind" behind the killing of Cavazos, who governed Colima from 2005 to 2009.

Mendoza Chavez allegedly headed a ring that trafficked cocaine, marijuana and meth in Colima and the U.S. market.