Russia Steps Up Hacking, Spurring U.S.-U.K. Warning on Risk

Russia is using compromised computer-network equipment to attack U.S. and British companies and government agencies, the two countries warned in an unprecedented joint alert.

The warning on Monday came from the U.S. Department of Homeland Security and Federal Bureau of Investigation and Britain’s National Cyber Security Center. It included advice to companies about how to protect themselves and warned specifically of attacks on routers, the devices that channel data around a network.