Ten people were wounded in three grenade attacks in the western Mexican state of Michoacan, the public prosecutor's office said Friday, dpa reported.
The victims included three police officers and seven civilians.
One attack took place early Friday in the port of Lazaro Cardenas. The other two occurred in the town of Uruapan. Michoacan Attorney General Miguel Garcia Hurtado said the attacks were "without a doubt" the work of organized crime gangs.
The grenade missed its mark in the port attack, landing on the street instead of the house it was aimed at, Garcia Hurtado said. "The house that was being guarded had been seized 15 days earlier because a clandestine laboratory had been found there," he said.
In Uruapan, miscreants hurled a grenade at a house where police last year found nine bodies. Late Thursday, two men on a motorcycle threw a grenade at a parked patrol car. One police officer and five civilians were injured.
Mexican President Felipe Calderon comes from Michoacan, a state that has a several powerful drug cartels.