The remains were unearthed between Tuesday and Thursday in 17 pits on a hill in the village of Pochahuixco, part of the municipality of Zitlala, a region beset by turf wars between drug cartels.
"The discoveries are terrible," Guerrero state security spokesman Roberto Alvarez said, adding that the victims include 31 men and one woman.
The remains were taken to the state capital, Chilpancingo, to be identified, Alvarez said in a statement yesterday. No arrests have been made in the case.
No other remains were found but soldiers are scouring the region for any other hidden graves. No arrests were made.
Drug cartels have been burying their victims in hidden graves across the country for years, and authorities regularly find human remains.
At the border between the western states of Jalisco and Michoacan, for instance, 75 bodies were unearthed from 37 clandestine graves between late 2013 and early 2014.
The clandestine graves were found after authorities received an anonymous tip about a camp where people were being held, Alvarez told AFP.
When they arrived at the site on a hill, they found a kidnap victim as well as two cars, a motorcycle and bulletproof vests.
Soldiers and police also found four heads inside a cooler that could be linked to nine bodies that were found on a roadside in the town of Tixtla a few days ago, he said.
"There are a lot of murders, a lot of abductions," he said.
Guerrero is one of the country's most violent states and a major opium poppy grower. Last weekend at least 24 people were killed in the state.
Los Rojos have also been battling the Guerreros Unidos drug cartel. In the Pacific resort of Acapulco, the Beltran Leyva gang and the Independent Cartel of Acapulco battle for supremacy.
Guerrero is also known for the disappearance of 43 students in the city of Iguala in September 2014, a case that drew international outrage and remains unsolved.
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