Police tweeted at 4:13 a.m. that the shooting happened in the area of 15th Street and L Street
The location is about five blocks away from a deadly mass shooting back in April that left six people dead and 12 others injured.
J Street, L Street and 16th Street are closed due to the investigation, police said.
No other details were released. Police are asking for the public's help to identify the shooter.
Stay with ABC7 News on this developing story.