Hundreds of people ignored the coronavirus lockdown rules and went to an illegal rave in Leeds at the weekend.
West Yorkshire Police officers were called to an underpass of the M1, near junction 45, at around 10pm on Saturday, June 13.
They dispersed a crowd of more than 400 people, but no arrests were made and no injuries have been reported.
They also had to close a section of the M1 to allow ravers to leave the event safely.
On the same night, more than 6,000 people attended illegal "quarantine raves" in Greater Manchester. A 20-year-old man died, a woman was raped and three people were stabbed at those events.
Chief Superintendent Damien Miller, Leeds District Commander, said: “While these events are unlawful at any time and cause significant disruption, they clearly create an additional unnecessary risk to public health amid the coronavirus pandemic.
“Current restrictions prohibit outdoor gatherings of more than six people and we continue to ask the public to be mindful of their own health and safety and that of the wider public by following the current guidelines.
“We have specific powers to stop illegal raves and there remains a city-wide injunction in place to tackle the anti-social use of motor vehicles. We will continue to make full use of these powers to deal with any further events.
“We are also continuing to carry out follow-up enquiries and working with Leeds Anti-Social Behaviour Team to take appropriate action around those involved in organising these events.
“Our general stance in terms of coronavirus restrictions is to engage, explain and encourage to influence people’s behaviour and to only use enforcement where necessary.
“Coronavirus remains a deadly disease and we would ask that people recognise the risks their behaviour can create and urge them to behave responsibly in line with the current restrictions.”
