Police today found 12 bullet-riddled bodies in a pickup truck in northwestern Mexico, authorities said.
The bodies, which have not been identified, were recovered in the state of Sinaloa, the home base of the Sinaloa drug cartel.
Marco Antonio Higuera Gomez, the state's attorney general, said the bodies had gunshot wounds and bore signs of having been tortured.
They were found inside the double cab and rear bed of the vehicle, which turned up in the town of San Ignacio.
Some of the corpses were dressed in black and had on tactical combat vests, according to Higuera, who said they had not yet been identified.
Members of the Zetas, a rival cartel, often wear black during armed attacks.
Violence has flared in parts of northern Mexico since the arrest in February of the Sinaloa cartel's leader, Joaquin "El Chapo" Guzman, considered the world's most powerful drug lord.
A man alleged to be the cartel's top lieutenant in the northern region of Chihuahua, Juan Carlos Lopez Lopez, was arrested on Saturday.
