White House on alert after shooting on street outside

A Secret Service Police Officer works outside of the guard entrance on 17th Street Northwest near the White House in Washington, Friday, May 20, 2016, after the White House was placed on a security alert after a shooting on a street outside.

A Secret Service Police Officer stands outside of the guard entrance on 17th Street Northwest near the White House in Washington, Friday, May 20, 2016, after the White House was placed on a security alert after a shooting on a street outside.

U.S. Secret Service officers block 17th Street next to the Eisenhower Executive Office Building in Washington, Friday, May 20, 2016, after the White House was placed on a security alert after a shooting on a street outside.

A White House chef walks past Secret Service agents as they stand on the North Lawn of the White House in Washington, Friday, May 20, 2016, after the White House was placed on security alert after shooting on street outside.

A Secret Service agent looks through binoculars as he stands at the North Portico of the White House in Washington, Friday, May 20, 2016, after the White House was placed on a security alert after a shooting on a street outside.

A security agent stands nearby the Northwest gate of the White House in Washington, Friday, May 20, 2016, after the White House is placed on lockdown for a shooting nearby.