BREAKING: White House On Lockdown After Shots Fired At US Capitol Building Visitors Center

Little is known so far. From the Associated Press:

The U.S. Capitol Police are telling staff in the Capitol complex to shelter in place after a report of gunshots being fired in the Capitol Visitors Center. The White House also was put on lockdown because of the report. The situation was apparently contained to the Visitors Center but no further information was immediately available. A Capitol Police spokesman did not immediately respond to a request for comment.

Senate alerts say gunshots have been reported in the Capitol Visitor Center https://t.co/6OZtrfIwim https://t.co/mE8peE8DjR

— CNN Politics (@CNNPolitics) March 28, 2016

UPDATE: It might be over already.

WASHINGTON (@AP) — Capitol officials: 1 Capitol police officer shot, not seriously, shooter in custody.

— Fox5NY (@fox5ny) March 28, 2016