MEXICO CITY -- Mexico's government says police have unearthed 429 bodies since April from a series of clandestine graves in the northern states of Durango and Tamaulipas. Both states are wracked by drug violence.

Federal Attorney General Marisela Morales says police have found 236 bodies in Durango's state capital, which is also named Durango. She says many could be victims of a battle for power within the Sinaloa drug cartel.

Morales says an additional 193 corpses have been found in the town of San Fernando in Tamaulipas state. Officials say most of those were Mexican migrants heading to the United States who were kidnapped off buses and killed by the Zetas drug cartel.

The attorney general released the new body count Tuesday.