NEW : Police Chief Cathy Lanier praised the speed and cooperation by various law enforcement agencies that responded . The D.C. police chief describes multiple teams going after the building . A Navy commander saw a man die before his eyes . People were pushing , shoving , falling , a reporter said . A fire alarm was the first hit , then chaos ensued .
NEW : The D.C. police chief describes multiple teams going after the building . A Navy commander saw a man die before his eyes . People were pushing , shoving , falling , a reporter said . A fire alarm was the first hit , then chaos ensued .