44 people have been fined for attending a rave in a disused bank vault.
Police busted the party in Southall, West London last Sunday morning after hearing music coming from an abandoned building.
Cops found a rave in full swing at around 9am, complete with a firing soundsystem and lighting.
The revellers are now facing a fixed penalty notice of up to £800 and officers are looking for the organisers of the rave, who could face a fine of £10,000, Metro reports.
Detective Chief Inspector Thomas Bowen, said: "It is disappointing some selfish people still insist on breaking Covid regulations.
"We will continue to do our part in shutting illegal events like this down and taking action where necessary."
Police have been playing cat and mouse with ravers during lockdown since last summer. Read our report on the UK's lockdown rave scene here.