Mexico ? Gunmen stormed a party in northern Mexico on Sunday and massacred 17 people, authorities said.

The assailants arrived at the gathering in the city of Torreon in several cars and opened fire, the Coahuila state Attorney General’s Office said in statement. At least 18 people were wounded.

Several of the victims were young and some were women, but their identities and ages had not yet been determined. Investigators had no suspects or information on a possible motive.

Coahuila is among several northern states that has seen a spike in drug-related violence that authorities attribute to a fight between the Gulf cartel and its former enforcers, known as the Zetas.