Inaky Blanco, the chief prosecutor of violence-plagued Guerrero state, said yesterday 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 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 kilometres south of Mexico City.
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.
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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 by far the most horrific since President Enrique Pena Nieto took office in December 2012.
Survivors said the students had gone to Iguala to conduct fundraising activities and came under attack by police after they boarded three buses.
In all, three students were killed in the shooting and another three people died in an attack on a football team's bus outside Iguala later that night. Blanco said police and gang members were involved in both crimes.
Witnesses say several students, who are from a teacher training college known as a hotbed of radical protests, were whisked away in police vehicles.
The gangsters made the students exit a bus. "They grabbed 17, took them to the top of a hill in Pueblo Viejo where they have clandestine graves and where they say they killed them," Blanco said.