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The United States announced the seizure on Thursday of 41 internet domains allegedly used by Russian intelligence agents to try to gain access to the computers and email accounts of Pentagon, State Department and other US government employees.

"The Russian government ran this scheme to steal Americans' sensitive information, using seemingly legitimate email accounts to trick victims into revealing account credentials," Deputy Attorney General Lisa Monaco said in a statement.

According to the Justice Department, the domains were used as part of "an ongoing and sophisticated spear-phishing campaign" by the so-called "Callisto Group," an operational unit within Center 18 of the Russian Federal Security Service (FSB).

Among those targeted were US-based companies, former employees of the US intelligence community, former and current Department of Defense and Department of State employees, and staff at the Department of Energy.

The Justice Department said Microsoft had simultaneously filed a civil action to seize 66 internet domains allegedly used by the Callisto Group, which the US software giant calls "Star Blizzard."

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