The U.S. Treasury Building as seen from the Bank of America offices. (Photo by Chip Somodevilla/Getty Images)WASHINGTON (AP) - U.S.
government agencies and private companies rushed Monday to secure their computer networks following the disclosure of a sophisticated and long-running cyber-espionage intrusion that experts said almost certainly was carried out by a foreign state.It was not yet clear who was responsible for the intrusion, though it was reportedly conducted by Russia, and the extent of the damage is not yet known.