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A large gun battle in the northern Mexican town of Calera, in the state of Zacatecas, left 14 armed civilians dead and three police officers wounded on Monday.
Mexican police forces were conducting a tactical operation in the area when they were attacking by more than a dozen gunmen. Two police officers suffered shrapnel wounds and another was shot. All three are in stable condition, according to the Associated Press.
Following the gunfight, the police confiscated the gunmen's vehicles and found eight assault rifles, including one with a grenade launcher attachment.
Zacatecas has been the site of escalating cartel violence between the Sinaloa and Jalisco New Generation cartels and the remnants of Los Zetas cartel.