FILE - In this Sept. 10, 1971 file photo, inmates wearing cloaks and football helmets stand behind bars in a corridor leading to D block as they begin negotiatiations with New York State officials after a prison uprising at Attica State Prison, in Attica, N.Y. New York's Attorney General Eric Schneiderman has asked a state judge to unseal documents about the 1971 riot and retaking of Attica state prison in the nation's bloodiest prison rebellion. (AP Photo/Bob Schutz, File)
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