Twenty dead bodies discovered in Mexico, including corpses hanging from bridge

Four decapitated corpses were found hanging from a highway bridge leading out of the city. The bodies' heads were discovered nearby in a plastic bag, authorities said, according to the Associated Press.

Culiacan, which has around 1 million residents and is the capital of western Mexico's Sinaloa state, has been wrought by a war for control between two rival drug trafficking groups of the Sinaloa cartel - Los Chapitos and La Mayiza. 

Mexican authorities condemned the deadly acts on Monday. However, many Sinaloa residents say authorities no longer have control of the violence, according to AP.

"Military and police forces are working together to reestablish total peace in Sinaloa," Feliciano Castro, Sinaloa government spokesperson, said in a statement on Monday.

The Attorney General's Office of the State of Sinaloa did not immediately respond to Fox News Digital's request for comment.

The Associated Press contributed to this report.