While Mexican prosecutors declared last year that 43 missing students were incinerated at a landfill, official documents show one gang suspect testified that at least nine were slaughtered elsewhere.
The office of Mexico's attorney general posted on its website Sunday the 54,000 pages of documents from the much-criticized investigation into a case that has bedeviled President Enrique Pena Nieto's administration.
A review by AFP of hundreds of pages found contradictory testimony among some of the more than 100 suspects who have been detained, including Guerreros Unidos drug cartel members and municipal police officers.
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Gomez's predecessor, Jesus Murillo Karam, concluded late last year that police in the southern city of Iguala attacked the students on September 26, 2014, after they had seized buses for a protest in Mexico City.
Murillo Karam said the officers abducted 43 students and handed them over to the Guerreros Unidos drug gang, which confused them with rivals, killed them and incinerated their bodies at a garbage dump in the neighboring town of Cocula.