While the government said the Sept 26 attack was a case of mistaken identity, the report said the violent reaction to the students, who were hijacking buses for transportation to a demonstration, may have had to do with them unknowingly interfering with a drug shipment on one of the buses.
Iguala, the city in southern Guerrero state where that attacks took place, is known as a transport hub for heroin going to the United States, particularly Chicago, some of it by bus, the report said.
The report means that nearly a year after the disappearance, the fate of 42 of the students remains a mystery, given the errors, omissions and false conclusions outlined in more than 400 pages by the experts assembled by the Inter-American Human Rights Commission.
The team interviewed witnesses and detainees and reviewed the government's evidence and conclusions. A charred bone fragment of only one of the 43 has been identified and wasn't burned at the high temperature of an incineration, contrary to Mexican investigators' claims.
In point after point, the international team of experts, including lawyers, former prosecutors and a medical doctor, says the government investigation was wrong about the nature of and the motive for the attacks.
It is an indictment of Mexico's investigative procedures and conclusions, and cites key evidence that was manipulated or that disappeared.
Federal police and military were aware of the shootings and present at some of the crime scenes, according to the report. While their involvement is unclear, at the very least they failed to intervene to stop a widespread attack on unarmed civilians.
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