Torren - Mexican police in the northern city of Torreon said on Saturday they found the headless bodies of seven men and three women in the back of an abandoned truck.
Police chief Guillermo Flores told AFP that only one head, belonging to a woman, was found on site, and that the killers had placed it on the truck's hood.
The truck was parked on a highway that goes around Torreon, a city where two major highways heading north to the United States converge.
Mexico has been convulsed by a massive crime wave in recent years, with about 37 000 people killed in battles among rival drug cartels and between traffickers and security forces since 2006, when the government launched a military crackdown.