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By Francesca Gillett
BBC News
No new Covid restrictions will be brought in for England before Christmas, the prime minister has said.
But Boris Johnson said "we can't rule out any further measures after Christmas" - and that Omicron was spreading at a speed never seen before.
"The government will continue to monitor the data closely and will not hesitate to act after Christmas if necessary," he added.
Earlier, Scotland announced tough new measures to start from Boxing Day.
Large events will have limits on the number of people that can attend, and Edinburgh's Hogmanay celebrations have been cancelled.
In a video clip released on Tuesday, Mr Johnson said: "What I can say tonight, is that naturally we can't rule out any further measures after Christmas - and we're going to keep a constant eye on the data, and we'll do whatever it takes to protect public health.
"But in view of the continuing uncertainty about several things - the severity of Omicron, uncertainty about the hospitalisation rate or the impact of the vaccine rollout or the boosters, we don't think today that there is enough evidence to justify any tougher measures before Christmas.
"We continue to monitor Omicron very closely and if the situation deteriorates we will be ready to take action if needed."
He said people can go ahead with their Christmas plans but should exercise caution - and repeated his appeal for everyone to get a booster jab.
Another 90,629 new Covid cases were reported across the UK on Tuesday - slightly down on the all-time highs announced last week.
The highly-mutated Omicron variant continues to spread around the UK and has become the dominant strain in England and Scotland, health experts say.
Earlier on Tuesday, the government said it would be providing cash grants to hospitality businesses affected by the surge in Covid cases, after pubs and restaurants said there had been a wave of cancellations.