Umar Farouk Abdulmutallab, the so-called "underwear bomber" accused of trying to blow up an airliner over Metro Detroit on Christmas Day 2009, says he assaulted several prison guards Wednesday while he was observing the holy month of Ramadan.

The disclosure came in a handwritten letter Abdulmutallab filed Thursday in U.S. District Court in Detroit. In a second filing, Abdulmutallab, 24, asked a judge to immediately release him from a federal prison in Milan, said he is being wrongly imprisoned and should be judged by the law of the Quran.

The filing doesn't make clear what prompted the alleged assault, but Abdulmutallab seems to make a connection to his observance of the Muslim holy month.

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