Police are still searching for the suspect.
The shooter is believed to be on the loose.
At least three officers are feared dead.
U.S. Joint Base Andrews is about 15 miles from the White House and the home of Air Force One.
LOS ANGELES (Reuters) - A one-year-old girl was killed on Tuesday when a bullet from an apparent gang-related shooting pierced the wall of her Los Angeles home and struck her in the head, law enforcem...