Watch part two The motives of Major Nidal Hasan -the US army psychiatrist accused of killing 13 people last week in the world's biggest military base, Fort Hood, Texas - remain a mystery. But the shooting spree has sparked a raging debate across the country.Was he a "radical Muslim" who suddenly became intent on killing Americans? Was he desperate to avoid deployment to Afghanistan? Was he fed up with harassment by fellow soldiers for being Muslim, as his family says?What are the implications for Muslims in the armed services, and in American society in general?
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