Hacking campaign targeted US energy, treasury and commerce agencies

Significant and ongoing' cyber attack, suspected to be the work of Russia, poses a grave risk to critical infrastructure entities' as well

The US government continues to reel from a large and sophisticated hacking campaign that affected top federal agencies, including the energy department, the treasury and commerce departments, and is even said to have targeted the agency responsible for the country's nuclear weapons stockpile.

Authorities expressed increasing alarm over the hack, suspected to be the work of Russia, warning that it poses a grave risk" to federal, state and local governments, as well as critical infrastructure entities".