The Oslo Municipality said in a statement on Thursday that "more cases are expected" and "effective tracing is being done to limit transmission routes and prevent major outbreaks."
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More than 50 people in Norway are feared to have been infected with the Omicron coronavirus variant after attending a work Christmas party in Oslo.
The Oslo Municipality said in a statement on Thursday that "more cases are expected" and "effective tracing is being done to limit transmission routes and prevent major outbreaks."
If confirmed, the cases would be the biggest single known outbreak of Omicron in the world.
Those affected are said to live within Oslo and the surrounding areas.
The outbreak occurs after No 10 advised Christmas party numbers in the UK should not be limited.
Downing Street rejected a suggestion from a minister that staff parties should be cancelled or scaled back in the run-up to Christmas.
Coming just two days after the Prime Minister urged people to carry on as normal with their Christmas plans, business minister George Freeman appeared to muddy the waters by suggesting parties may depend on how many people are attending.
