Drone footage from Birmingham shows more than 200 revellers flouting restrictions by holding raves for the second weekend.
The illegal gatherings come as coronavirus cases in the city have rocketed from 13.8 per 100,000 people to 28.1.
West Midlands Police busted the huge DJ-led block party in Hampton Street in the city centre which took place on Friday night.
Drone images show the ravers partying hard into the early hours of Saturday.
It comes after an illegal rave was broken up last weekend, with a DJ having travelled 60 miles, and more than 100 gatherings were broken up in the city.
Superintendent Jack Hadley shared pictures from the drone and video from ground level of the rave which he said created a “huge amount of rubbish”.
He tweeted: "Op. Reliant officers have attended more than 80 incidents of large gatherings and unlicensed music events where people are flaunting covid regulations and causing significant disruption to the communities around them.
"Such selfish behaviours will not be tolerated.
"Our @WMPolice drone is gathering evidence to allow us to prosecute the organiser of this illegal music event.
"This type of behaviour is dangerous and will not be tolerated!
"Officers are disrupting yet another 'block party' in Birmingham, 200 people crammed into communal area with sound systems.
"A huge amount of rubbish has been left at this illegal music event in Hampton Street.
"Complete and utter disregard for other people who may need to use this car park tomorrow!"
West Midlands Police Chief Constable Dave Thompson said: "Once again very grateful to staff dealing with unlicensed events under #operationreliant.
"There is no place for these in a pandemic and they stop officers dealing with other calls for people in need."
The raves come a week after police busted 125 separate parties which took place across the city.
Chief Superintendent Claire Bell warned people of the dangers of flouting the law.
She said: "While we accept the last few months have been extremely difficult and people want to get out and have some fun, gatherings such as parties and unlicensed music events only increase the risk of spreading the virus.
"Please think - is it worth the risk? You could be putting the lives of your family and friends at risk.
“We’re continuing to urge people to inform us if they hear of plans for raves and large gatherings in parks which can also lead to anti-social behaviour and noise nuisance."
