Police say they will take action against the organisers of an illegal rave in the countryside near Bath.
The event, at the former RAF Charmy Down airfield about three miles from the city, began late on Saturday and is still ongoing.
People living as far away as Bristol complained that the noise had kept them awake.
Avon and Somerset Police said the organisers were "selfish" to hold the event during the coronavirus lockdown.
Police say they first started getting calls about the event just after 23:00 BST on Saturday and diverted patrols to the scene.
When officers arrived, they found several hundreds people were at the rave, with more arriving.
A statement from Avon and Somerset Police said: "Officers closed off the approach routes, however people were abandoning vehicles and making their way to the site on foot. Officers were still turning vehicles away at 6:40am on Sunday.
"A full risk assessment last night concluded that the potential risks to public safety of an intervention to close an event attended by more than 3000 people in dark and wet conditions were too great.
"There were also other significant incidents across the force area including 120 999 calls which required an immediate police response and the attention of our resources. Therefore the decision was taken to contain the event until daylight hours. "
Tanya Rich, who lives in Weston in Bath, said the music from the rave, held close to the A46, woke her up at 5am.
"I heard this thumping sound. I thought someone had their car stereo on loud and it would stop, but it kept going," she said.
"I went on my local Facebook group and everyone was talking about it and complaining.
"People have been saying they can hear it as far away as Longwell Green, even Kingswood.
"It's so loud. You couldn't have a window open."
Avon and Somerset Chief Superintendent Ian Wylie said: "We're working with neighbouring forces and other agencies including Bath and North East Somerset Council, highways, and the ambulance service, to close down this event in a controlled way and ensure those attending are able to disperse safely.
"We're sorry for the disruption caused to so many residents by the selfish actions of the organisers of this event and those attending, knowing the problems it would cause and the ongoing risk to public health of large gatherings due to COVID-19.
"We will take appropriate action against those responsible and would ask anyone with evidence which could help to get in touch by calling 101."