WTOP's Dick Uliano: Park Police Chief Teresa Chambers says helicopters are eyes in the sky for officials.
WTOP's Dick Uliano: It's a very dynamic situation and police at the scene are reluctant to give numbers on the shooting.
Witness: 'It was like pow, pow, pow'
Witnesses recall Navy Yard shooting:
D.C. police traffic UPDATE: M St Remains CLOSED from S. Cap to 11th St The N/B 11th St/Welsh Bridge is also CLOSED. The S/B span is OPEN