Six severed human heads were found on a road connecting the Mexican states of Puebla and Tlaxcala on Tuesday, Aug. 19. A person called 911 after seeing a head on the side of the road.

The heads, all belonged to males, the Tlaxcala State Attorney General's Office announced as police hunt their killer.

Six severed heads have been found on a road in central Mexico, in an area not normally associated with cartel violence. Local authorities made the discovery early on Tuesday morning on a route that links the broadly peaceful states of Puebla and Tlaxcala.