This is a breaking news story. Check back for updates.
UPDATE 3:40 p.m. EST: The coast is clear.
Investigation 1200 N Capitol St NW has concluded / All streets have re-opened with the exception of service road 1200 block of N Cap south.
â€” DC Police Department (@DCPoliceDept) December 20, 2013
The Washington, D.C., Police Department has shut down a portion of the city to traffic Friday due to “police activity.”
The department did not elaborate on the reason for the closures on its Twitter account, but Washington Post reporter Peter Hermann wrote that the 10-square-block area around 1200 North Capitol St. NW was closed due to a potential pipe bomb in an apartment building.
“Police and fire have not confirmed pipe bomb – they are checking situation out now,” Hermann tweeted. “Roads closed as a precaution.”