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

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.

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.