in september 2015 , the results of a six-month investigation Criminal_investigation by a panel of experts assembled by the inter-american commission on human rights stated Statement that the government 's claim Statement that the students were killed Killing in a garbage dump because they were mistaken Judgment_communication for members of a drug gang was `` scientifically impossible '' given Giving the setting 's conditions .

Most of the bombs were hidden Hiding_objects in garbage bins and detonated Attack nearly at the same time starting Process_start at 21:00 .