Iguala

The governent believed the youths were killed and incinerated.

The attorney general's office says the number of bodies found from October to May could be more, because it is counting only those instances in which its mass grave specialists get involved.

The commission, in a report issued Thursday, said Mexican authorities failed to follow lines of investigation and neglected the needs of the victims to an extent that constitutes violations of human rights.

The report lists key people and evidence — including a cellphone message from one student after he was kidnapped — that were never pursued in the Sept. 26 attacks in the southern city of Iguala.