Published: Sep 13, 2010 5:48 PM EDT
Updated: Sep 13, 2010 2:48 PM EDT

WASHINGTON (AP) - Police evacuated part of the Capitol building Monday after a powdery substance was found in the visitors' gallery overlooking the House chamber.

Capital Police spokeswoman Kimberly Schneider said the gallery was cleared "out of an abundance of caution" while police investigated the substance.

Reporters in the House press office were also asked to move to other areas of the building, which were not affected. Schneider said there were only a few House pages in the gallery when the substance was discovered.