(BBC) Forensic experts have been sent to the Mexican town of Carrizalillo to examine human remains found in a number of mass graves.
The location was disclosed by a member of a drugs gang who was attacked by residents of Carrizalillo.
The town is 75km (47 miles) south of Iguala, where 43 students disappeared over a year ago.
Carrizalillo residents say there was unusually high gang activity on the night of the students’ disappearance.