Boston Marathon bombing suspect pleads not guilty

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Boston Marathon Bombing
An MIT police officers stand at attention outside the federal courthouse wearing a bracelet honoring fallen colleague Sean Collier prior to arraignment for Boston Marathon bombing suspect Dzhokhar Tsarnaev Wednesday, July 10, 2013, in Boston. MIT officer Sean Collier was killed by the alleged suspects. The 19-year-old Tsarnaev has been charged with using a weapon of mass destruction, and could face the death penalty. (AP Photo/Winslow Townson)