Police have broken up a wedding with 400 guests in attendance in north London, and its organisers now face a £10,000 fine.
Five other guests were also issued £200 fines, police have said.
Despite London being under an England-wide lockdown which prevents social mixing between households and weddings and civil partnership ceremonies allowed up to just six people, officers were called to Yesoday Hatorah Girls Senior School in Stamford Hill in north London shortly 9pm last night (Thursday January 22) to find up to 400 people inside.
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The windows had been covered when they arrived.
The BBC has seen a Metropolitan Police statement to community leaders, which said there was "clear evidence of a wedding having taken place."
Detective chief superintendent for the Met, Marcus Barnett, said: "This was a completely unacceptable breach of the law, which is very clearly in place to save lives and protect the NHS.
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"An NHS that is under considerable pressure at a time when Covid 19 has killed nearly 100,000 people.
"This is a deadly and very dangerous disease. We can all see that and we must act responsibly.
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"People across the country are making sacrifices by cancelling or postponing weddings and other celebrations and there is no excuse for this type of behaviour.
"My officers are working tirelessly with the community and we will not hesitate to take enforcement action if that is required to keep people safe."
The area is home to the UK's largest Charedi community of strictly Orthodox Jews. Stamford Hill is part of the borough of Hackney which has a Covid 19 infection rate of 625.43 cases per 100,000 people.
The England average rate is 471.31 per 100,000 people, with people asked to only leave home for limited reasons such as shopping, going to work, seeking medical assistance, or avoiding domestic abuse.
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