A shooting has been reported outside the White House, according to US Park Police.
Police told ABC News that a Secret Service agent shot an armed man at a security checkpoint near the building.
The White House is on lockdown in response to the shooting. President Barack Obama was golfing in Maryland at the time.
The victim is being transported to a local hospital with critical injuries, authorities have said.
Vice President Joe Biden was in the White House at the time.
http://www.bbc.co.uk/news/world-us-canada-36348361