IGUALA, Mexico - Two gang hitmen linked to police admitted to killing 17 of 43 students missing in southern Mexico, amid fears the victims were among bodies found in a mass grave.
Inaky Blanco, the chief prosecutor of violence-plagued Guerrero state, said Sunday it would take at least 15 days to identify the 28 bodies in the clandestine grave, some of which were badly burned and in pieces.
The site was found Saturday on a hill in Pueblo Viejo, an impoverished district of the city of Iguala, where the missing students were last seen on the night of September 26, some 200 kilometers (125 miles) south of Mexico City.
"A bed of branches and tree trunks was made, on which the bodies of the victims were laid and a flammable substance was used," Blanco said.
The students disappeared after Iguala municipal police officers shot at buses transporting them, and Blanco said the Guerreros Unidos gang participated in a night of violence that left six people dead, 25 wounded and 43 missing.
While the students are accused of having hijacked the buses, Blanco said the motive for the attack remains under investigation.
The case could become one of the worst slaughters that Mexico has witnessed since the drug war intensified in 2006, leaving 80,000 people dead to date, and the most horrific since President Enrique Pena Nieto took office in December 2012.
Parents hold out hope
Earlier Sunday, some parents and hundreds of fellow students from the missing group's teacher training college blocked the highway between Guerrero's capital Chilpancingo and Acapulco, voicing anger at the authorities.
Some of the parents said they were shown pictures of the bodies but that they did not believe that they looked like their children.
"As parents, we reject this situation. It's not the youngsters. We know they're holding them alive," said Manuel Martinez, whose son is among the missing.
Relatives have given DNA samples to see if they match the bodies in the mass grave, while Blanco said the search for the missing would continue as long as the identities are not confirmed.
Survivors said the students had gone to Iguala to conduct fundraising activities and came under attack by police after they boarded three buses.