Mexican officials say they've identified 1 of 43 missing Mexican students

MEXICO CITY, Dec. 6 (UPI) -- Mexican officials announced Saturday they've identified the remains of 1 of the 43 Mexican students who went missing in September.

Alexander Mora Venancio's remains were identified by DNA testing bone fragments found in the garbage dump where it was believed the bodies were burned.

Three Mexican gang members have confessed to killing the students under orders from Iguala Mayor Jose Luis Abarca and his wife, and Mexico City's chief of police, Jesus Rodriguez , recently stepped down after reports of abuse during demonstrations over the disappearance of the students.

The missing students were from Escuela Normal Rural de Ayotzinapa, and their bus was attacked by gunmen while they were on their way to a protest on Sept. 26. Three students were killed during the attack.

Protesters who are upset over the disappearance of the students have called for the resignation of Mexican President Enrique Peña Nieto.