FOG BLOG U.S. POLITICS LOG: CYBER ATTACK ON U.S. GOVERNMENT!:

THE U.S. GOVERNMENT SUFFERED A CYBER ATTACK ON MANY OF ITS DEPARTMENTS, SAID TO BE WORST IN U.S. HISTORY!....The US energy department is the latest agency to confirm it has been breached in what is being described as the worst-ever hack on the US government.

The department is responsible for managing US nuclear weapons, but said the arsenal's security had not been compromised.

Tech giant Microsoft also said on Thursday that it had found malicious software in its systems.

Many suspect the Russian government is responsible. It has denied any role.

The US treasury and commerce departments are among the other targets of the sophisticated, months-long breach, which was first acknowledged by officials on Sunday.

• SolarWinds: Why the Sunburst hack matters

• More US government agencies hacked

• 'State-sponsored' hack hits US cyber-security firm

• Tech Tent: Hacking the heart of the US government

Researchers, who have named the hack Sunburst, say it could take years to fully comprehend what is one of the biggest ever cyber-attacks.