U.S. Army Maj. Nidal Hasan is charged with a 2009 killing spree that killed 13 people at Fort Hood in Texas. Homegrown terrorism by Muslim Americans has been growing over the past decade. HO/AFP/Getty Images hide caption

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January 2010: Muslim-Americans protest against terrorism outside a federal court building in Detroit, where "Christmas Day" bomber Umar Farouk Abdulmutallab was being arraigned. Stan Honda /AFP/Getty Images hide caption

itoggle caption Stan Honda /AFP/Getty Images