Mexico's independent Miguel Agustin Pro Human Rights Center (or Centro Pro) on July 2 released new evidence that high-ranking military officers gave soldiers orders to kill prior to an army mass slaying of more than 20 supposed narco-gang members in June 2014. The facts of the bloody incident at Tlatlaya, México state, have been disputed for over a year now. Purported documents from the 102nd Infantry Battalion released by the Centro Pro read like extermination orders. "Troops must operate at night, in massive form, reducing daytime activity, to kill criminals in hours of darkness," one document says. This casts further doubt on the official version that the casualties died in a gun battle that began when suspects fired on soldiers in a warehouse raid. An investigation by the National Human Rights Commission (CNDH) has already determined that between 12 and 15 of the victims were killed unarmed or after surrendering. Yet the defense secretary, Gen. Salvador Cienfuegos, continues to stand by the official story, charging that "people and groups who perhaps don't like what the army is doing have already convicted the soldiers."