Mexico has started a new probe into the disappearance of 43 students last year.
On the night of September 26 last year, 43 students from a leftist oriented college hijacked buses to go to a demonstration in the city of Iguala, which is a transfer center for heroin headed to the US. They went missing after their buses were shot at by the police.
Three students and three bystanders were shot and the body of one the students, Julio Cesar Mondragon, was found hours after the clash in Iguala.
According to the official report, the students were confused with rival gang members, and drug cartel gunmen and corrupt policemen shot at their buses. The police then handed them over to the gang "Guerreros Unidos [United Warriors]" and the gang incinerated the students at a local dump.
But the families have never accepted the official report.
An independent report prepared by the Inter-American Commission on Human Rights (IACHR) stated that to cremate so many people would require much more time and wood, so they also rejected the official Mexican report.
The IACHR will oversee the new investigative unit.
Families had been camping out near the presidential complex since Thursday to demand a new investigation.
Attorney General Arely Gomez met them on Monday and announced a new investigative team is being set up, comprising of police, prosecutors and coroners.
A lawyer for the families, Vidulfo Rosales, said that with this step "the investigation takes on a new direction, with new avenues that are going to open up."