https://apnews.com/f32a2c951c84718381efd282d566f614

WASHINGTON (AP) — Federal authorities are expressing increased alarm 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 Thursday. The Department of Energy acknowledged it was among those that had been hacked.