Man shot near White House still critical

A man shot by a US Secret Service officer outside the White House remains in critical condition, a hospital official says.

A man shot by a US Secret Service officer outside the White House remains in critical condition. (AAP)

A hospital official says a man shot by a US Secret Service officer outside the White House remains in critical condition.

George Washington University hospital spokeswoman Susan Griffiths declined to provide further details on Sunday.

Authorities say an officer shot the man once on Friday after he approached a checkpoint and refused to drop his weapon.

A US law enforcement official said authorities had identified the gunman as Jesse Oliveri of Ashland, Pennsylvania.

Secret Service spokesman Robert Hoback said on Sunday that he could not provide any additional information about the incident.