Local News Boston Marathon Bomb Evidence April 17, 2013 / 7:20 AM EDT / CBS News Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: FBI via AP) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: FBI via AP) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters) Boston Marathon Bombings Evidence Part of a pressure cooker found on Boylston Street after the explosions. (Photo courtesy: CBS News via Reuters)