(AP) Federal authorities expressed increased alarm Thursday about a long-undetected intrusion into U.S. and other computer systems around the globe that officials suspect was carried out by Russian hackers. The nation’s cybersecurity agency warned of a “grave” risk to government and private networks.
The hack compromised federal agencies and “critical infrastructure” in a sophisticated attack that was hard to detect and will be difficult to undo, the Cybersecurity and Infrastructure Security Agency said in an unusual warning message. The Department of Energy acknowledged it was among those that had been hacked.