WASHINGTON, D.C. — A shooting occurred in close vicinity to the White House Friday, the U.S. Park Police said. A law enforcement source told CNN someone is down and in custody.

President Barack Obama is not at the White House, but Vice President Joe Biden was. CNN reports Biden was secured at the complex during the incident.

The White House was placed on security alert, U.S. Park Police said.

In a tweet, DC Fire and EMS said a patient has been taken to a hospital with critical injuries after a shooting at 17th and East streets.

UPDATE: Shooting at 17th and E Sts NW - 1pt transported with critical injuries to a local hospital #dctraffic — DC Fire and EMS (@dcfireems) May 20, 2016

Earlier in the afternoon, Secret Service officers cleared the White House North Lawn, Pennsylvania Avenue and Lafayette Park in an ongoing security incident.

Officers drew guns and ordered reporters to move inside.

This is a developing story. Refresh this page for updates.