Four decapitated bodies have been found hanging from a bridge in Mexico's Sinaloa state, part of a surge of violence that claimed the lives of 20 people in less than a day

A van containing 16 of the bodies was plastered with a banner referencing the ongoing wars between rival drug cartels in Sinaloa, authorities said.

Prosecutors in northern Mexico’s Sinaloa state are investigating the discovery of 20 male bodies with gunshot wounds – including five that were decapitated – on a bridge over a federal highway.