Photos: Capitol on lockdown after reports of gunfire

A Secret Service agent patrols the North Lawn of the White House on March 28, 2016, after reports of an active shooter at the U.S. Capitol.

An officer stands guard on a street leading to Capitol Hill in Washington that is closed March 28, 2016, after reports of gunfire at the Capitol Visitors Center complex.

Law enforcement and rescue vehicles are seen on Capitol Hill on March 28, 2016, after reports of gunfire at the Capitol Visitors Center complex.

A member of the uniformed Secret Service walks near the press briefing room and the North Lawn of the the White House in Washington, on March 28, 2016.

A Secret Service agent stands guard at the White House in Washington, DC, on March 28, 2016.

A Secret Service agent stands guard at the White House on March 28, 2016.

Secret Service agents stands guard at the White House on March 28, 2016.