The burned bodies of seven people, including four individuals who were beheaded, were found over the weekend inside a vehicle abandoned on the side of a highway in the western Mexican state of Michoacan, prosecutors said.

The victims, all males, were discovered Sunday inside the vehicle at kilometer 4 of the highway that links the city of Yurecuaro to La Concepcion, a town in neighboring Jalisco state, the Michoacan Attorney General’s Office said in a statement.

The victims were tortured and shot, but it has not been determined whether they were burned while still alive, crime scene investigators said.