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In a crowded market district. police warning everyone to stay down and hide. outside, thousands were fleeing in terror. >> like three men, with kind of bomb looking belt. a policeman was trying to put himself between these attackers and rest of the people trying to scare them. >> they shot and killed men who wore fake bomb vests wnt eight minutes of the first emergency call. >> we believe three suspects are dead. >> reporter: american intelligence now helping london police. >> we have a good wor...