[Updated at 1:01 p.m.] U.S. Capitol Police Sgt. Kimberly Schneider tells CNN an "all clear" has been given after the discovery of a suspicious powder led to evacuations of parts of the U.S. House Gallery.
[Posted at 12:30 p.m.] Parts of the U.S. House gallery have been evacuated while authorities investigate some powdery substance on the Gallery's floor, U.S. Capitol Police Sgt. Kimberly Schneider tells CNN.
A law enforcement source tells CNN the Capitol Police have evacuated galleries on the third floor, where tourists go to view the House chamber, as well as galleries for the press.
The House is still in recess, as members prepare to return to session tomorrow afternoon.
– CNN's Deirdre Walsh contributed to this report.