Gunmen massacred 17 people at a party in northern Mexico over the weekend.
The killings happened on Sunday in the city of Torreon located in the border state of Coahuila. It's among several northern Mexican states that have seen a spike in drug-related violence.
The assailants arrived in a convoy of vehicles, the Coahuila state Attorney General's Office said in a statement. Police found more than 120 bullet casings at the scene, most of them from.223-caliber weapons.
Several of the victims were young women. Police said they had no information on the motive for the killings.
According to officials, 24,800 people have been killed in drug-gang violence since President Felipe Calderon declared war on the cartels in December 2006, deploying soldiers and federal police to fight traffickers.