WASHINGTON, July 26 (Xinhua) -- A building of the ABC News network's Washington bureau was evacuated Thursday due to the discovery of a suspicious envelope with white powder, U.S. media reported.

    Police and firefighters rushed to the scene, and an all clear signal was given after the white powder in the envelop turned out to be aspirin.

    There was no note or address on the envelope containing the suspicious white power, and no one showed any medical symptoms, authorities said.