Large-scale hack sends US government agencies scrambling to secure data By Ben Fox and Frank Bajak Published (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. The potential threat was significant enough that the Department of Homeland Security’s cybersecurity unit directed all federal agencies to remove compromised network management software and thousands of companies were expected to do the same.