Mexican officials say gunmen shot and killed 20 people inside a bar in Monterrey, Mexico late Friday.
Local media say more than two dozen attackers opened fire on the patrons at a bar in a busy commercial district.
Monterrey has been the scene of deadly battles involving drug cartels fighting over routes into the United States.
Earlier Friday, Mexican police say the bodies of 10 men and woman were found shot on the outskirts of Mexico City.
Police say the victims were found in the Valle de Chalco area blindfolded and with their hands tied.