Experts name Russia a possible culprit after US government agencies hacked

The US Treasury Department building (Patrick Semansky/AP)

Hackers have broken into the networks of the US Treasury and Commerce departments just days after a leading global cybersecurity firm announced it had been breached in an attack that experts said bore the hallmarks of Russian tradecraft.

The FBI and the Department of Homeland Security’s cybersecurity arm are investigating what experts and former officials said appeared to be a large-scale penetration of US government agencies — apparently the same months-long cyberespionage campaign that also afflicted the prominent cybersecurity firm FireEye.