Police have found the bodies of six bricklayers who were working on a new elementary school in the northern state of Chihuahua. Two of them were mutilated.
Chihuahua state prosecutors say in a Monday statement that the men were found Sunday in a rural area of the town of Bocoyna, where they were building a school.
Prosecutors say one man was decapitated and another had his hands cut off. All had their throats slit.
They said the men bled to death and were later shot. Authorities found 25 spent bullet casings at the scene.
Prosecutors didn't have a motive or any suspects in the killings.
Chihuahua state is on the border with Texas and has seen a spike in violence as the Sinaloa and Juarez drug cartels fight for control of lucrative smuggling routes.