Officials in Mexico say they have found 64 bodies in dozens of mass graves in the western states of Jalisco and Michoacan.
Forensic scientists uncovered the graves during their search for two police officers who have been missing since the beginning of November.
The two federal officers are not among the dead found during the month-long search.
The area where the graves were located is disputed by rival drug cartels.
Some of the bodies showed signs of torture, while others had been bound and gagged.
Forensic tests suggest some had been buried up to three years ago.
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