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FILE - In this Sunday, Feb. 13, 2011 file photo, an Egyptian protester, center right, argues with a police officer in Tahrir Square in downtown Cairo, Egypt. A government inquiry into the deaths of nearly 900 protesters during Egypt’s uprising has concluded police were behind nearly all the killings and used snipers on rooftops overlooking Tahrir Square to shoot into the huge crowds. The report, parts of which were obtained by The Associated Press, is the most authoritative account of the killings and determines the deadly force used could only have been authorized by ousted President Hosni Mubarak's security chief, with the president’s full knowledge. (AP Photo/Emilio Morenatti, File)