Sinaloa Cartel
Allied forces of Los Zetas and Beltrán-Leyva remnants clashed on April 28, 2012 with gunmen of the Sinaloa Cartel in the Choix mountains. At least 32 armed men were confirmed dead. The renewed fighting in Sinaloa state between the BLO and Sinaloa Cartel is supposedly sparked by the incursion of the Sinaloa Cartel and its allies in Nuevo Laredo, traditionally the biggest Zeta stronghold.