Families and friends of missing persons have uncovered clandestine mass graves containing 32 bodies and nine human heads in Mexico's violence-plagued southern state of Guerrero.
The remains were unearthed between Tuesday and Thursday in 17 pits on a hill in the village of Pochahuixco, part of the municipality of Zitla, a region beset by turf wars between drug cartels.
"The discoveries are terrible," Guerrero state security spokesman Roberto Alvarez said.
The remains were taken to the state capital, Chilpancingo, to be identified, Mr Alvarez said in a statement. Soldiers are scouring the region for more hidden graves.
Drug cartels have been burying their victims in hidden graves across the country for years, and authorities regularly find human remains.
Guerrero is one of the country's most violent states and a major opium poppy grower, with the Guerreros Unidos and Los Rojos drug gangs engaged in brutal battles to control criminal operations that also include extortion.