Footage from the scene shows the moment of the explosion, which fired debris out of the building towards a passerby.
One person was injured by flying debris, sustaining only minor injuries.
DC Fire and Emergency Services had already evacuated the area due to “an active gas leak” and notified the gas company before the explosion occurred.
They said a secondary explosion occurred shortly after the first blast.
At least 16 children had been evacuated from a day care housed in a building that suffered damage in the blasts and were reunited with their families, with no injuries.