At least 12 bodies have been found in three days in a wooded area on the outskirts of Guatemala City.
According to firefighters and local media reports, the bodies had been dumped in an area where criminals often dispose of corpses.
Firefighter spokesman Hans Lemus told reporters that two bodies were found on Friday, and three bodies and a human skeleton on Saturday.
He added that on Sunday, with the help of search dogs, authorities located six more human remains and bodies wrapped in sheets and plastic bags.
In a message to reporters, the Ministry of the Interior said the murders could be linked to gangs fighting over territory.

Guatemala continues to grapple with widespread criminal violence, largely driven by the Barrio 18 and Mara Salvatrucha (MS-13) gangs, both designated as terrorist organisations by Guatemalan authorities and the United States.
In October, rescue teams discovered nine bodies beneath a bridge in Palencia, a town near the capital, showing the severity of the crisis.
Officials say drug traffickers and gang members involved in extortion account for nearly half of all violent crimes nationwide.
The country closed last year with a homicide rate of 16.1 per 100,000 people, more than twice the global average.
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