Mexican authorities say they have found four bodies in clandestine graves in the hamlet of Carrizalillo in the southern state of Guerrero.
The Attorney General's Office said it had brought in archaeological experts from Mexico's National Institute of Anthropology and History to help search for more graves using ground-penetrating radar normally used to locate pre-Hispanic tombs.
The office said Thursday that after digging in two pits found by local residents, investigators discovered the skeletal remains of a man and what appeared to be three women.
The Guerreros Unidos drug gang is active in the area. The gang is blamed for the disappearance of 43 students missing since September 2014 as well as for dozens of other bodies found in pits around the Guerrero city of Iguala.