U.S. Homeland Security Helping Ukraine Probe Power Grid Attack

The U.S. Department of Homeland Security said it was helping Ukraine investigate an apparent attack last month on the country's power grid that caused a blackout for 80,000 customers. Experts have widely described the Dec. 23 incident at western Ukraine's Prykarpattyaoblenergo utility as the first known power outage caused by a cyber attack.

• Read the article: Reuters