U.S. Ambassador Ken Salazar rejected accusations by Mexico’s president that the U.S. shares some responsibility for cartel violence in Sinaloa state.

Some 53 people have been killed and 51 others are missing in Mexico's western Sinaloa state since rival factions of the Sinaloa Cartel began clashing on Sept 9, local authorities said on Friday, with gruesome violence showing no signs of abating.

Mexican President Andrés Manuel López Obrador is asking the warring factions of the Sinaloa cartel terrorizing the capital city of Culiacán to act "responsibly” so no one else gets killed.

Shootouts in the western Mexican state of Sinaloa have kindled fears that an intra-cartel war is about to break out in the wake of the arrest of legendary trafficker, Ismael "El Mayo" Zambada, in July.

Two warring factions of the Sinaloa cartel have clashed in the state capital of Culiacan in what appears to be a fight for power since two of its leaders were arrested in the United States in late July.

Two warring factions of the Sinaloa cartel appear to be fighting for power since two of its leaders were arrested in the U.S.

Mexican leader says the U.S. bore some responsibility "for having carried out that operation" to arrest Ismael 'El Mayo' Zambada.

Rival factions of the Sinaloa drug cartel are waging a deadly war in northwestern Mexico, leaving dozens dead and missing in the wake of U.S. arrests of key cartel leaders. The violence between groups known as the “Mayos” and the “Chapos” erupted after U.