His condition was unknown.
There were no injuries to Secret Service personnel.
They also saw an individual on foot matching the description nearby.
U.S. Secret Service Uniformed Division officers patrol near the White House in Washington, DC, just after a shootout with an armed man.Kevin Dietsch/Getty Images
The incident is under investigation by the Metropolitan Police Department Internal Affairs Divisions Force Investigations Team, Buck said.
The group investigates all shootings involving law enforcement officers in the District of Columbia.
