FILE - The U.S. Treasury Building as seen from the Bank of America offices on September 29, 2014 in Washington, DC. (Chip Somodevilla/Getty Images)WASHINGTON - U.S.
authorities expressed increased alarm Thursday about an intrusion into computer systems around the globe that officials suspect was carried out by Russian hackers, with the nation's civilian cybersecurity agency warning that it poses a "grave" risk to government and private networks.The Cybersecurity and Infrastructure Security Agency said in its most detailed comments yet that the intrusion has compromised government agencies as well as "critical infrastructure" in a sophisticated attack that was hard to detect and will be difficult to undo.CISA did not say which agencies or.