Medical personnel are seen with a mock patient during a training exercise in New York, May 16, 2004, which simulated an explosion in the subway system. The four-hour drill, coordinated by the Office of Emergency Management and sponsored by the U.S. Department of Homeland Security, was staged at the Bowling Green subway station in lower Manhattan and involved more than 500 emergency responders and 200 volunteers acting as victims. REUTERS/Chip East CME/GN