A woman is facing a potential fine of £10,000 for allegedly hosting a party with up to 40 people in her South London flat.
Police were called to the property, in Grove Park, at approximately 3am on November 5.
There, officers witnessed approximately 30 people outside the block of flats in Ballamore Road, and conducted a search of the area.
They then attempted to enter the flat where they said approximately 20 people had been seen to leave.
According to London Metropolitan Police, nobody would inform officers of what was happening.
After being shut out of the property, officers were able to identify the organiser – approximately another 20 people then left the property.
Sergeant David Walmsley said: “Large gatherings in your own home are still unlawful and will not be tolerated.
“Officers will continue to enforce the Coronavirus regulations where necessary to help keep people safe.
“This was a totally egregious breach of the rules which meant officers had no choice but to issue a large fine.
“Events such as this are dangerous, there can be no excuse for this sort of reckless behaviour.
“We are still in national lockdown and the public should continue to abide by the regulations which have been put in place to save lives.”
Police said the resident of the flat denied allowing the number attendees to turn up to their address, and gave various names when asked to identify herself.
A spokesperson for the force said: “The 43-year-old woman was then arrested on suspicion of breaching the Health Protection (Coronavirus) Regulations 2020 and possession of a Class B drug.
“She has been released under investigation while enquiries continue for these offences.
“She has also been reported for consideration for receiving a £10,000 fine for breaching the Coronavirus regulations.”