FILE - In this Aug. 26, 2016 file photo, laminated images of the 43 missing students from the teacher’s college in Ayotzinapa, are tied to tree branches in Mexico City. Mexico has signed an agreement with the United Nations’ top human rights official for technical assistance in its latest attempt to determine what happened to the 43 missing students. U.N. High Commissioner for Human Rights Michelle Bachelet said Monday, April 8, 2019, that Mexico’s government is obligated to find the truth and that the process would be an opportunity to make deep changes to its justice system. (AP Photo/Marcos Ugarte, File)
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