US cyber-attack: Russia 'clearly' behind SolarWinds operation, says Pompeo
US Secretary of State Mike Pompeo has blamed Russia for what is being described as the worst-ever cyber espionage attack on the US government.
"We can say pretty clearly that it was the Russians that engaged in this activity," Mr Pompeo said on Friday.
He did not provide details about the alleged links to Moscow, and Russia has denied any involvement in the attack.
The hack, targeting software made by US firm SolarWinds, was discovered last week but has been going on for months.
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