Officers are currently at the scene of an illegal rave in south west Norfolk.
Police confirmed on Sunday (August 30) that they were in attendance at the unlicensed music event, which is taking place off the A134 at Lynford, near Brandon.
A spokesman for Norfolk Constabulary confirmed the rave had been “ongoing overnight”.
UPDATE: 500 people at illegal rave as paramedics rush to treat unwell man
On Sunday morning ravers were seen walking away from the party along both sides of the A134, with many drivers forced to swerve into the middle of the busy road to avoid them.
Dozens of cars were still parked in numerous lay-bys on the perimeter of Thetford Forest, while several vehicles had been left on the grass verge of the road leading from the A134 to Santon Downham.
An elderly woman, who lives in the village but asked not to be named, spent hours picking up litter left behind by party-goers including beer crates and nitrous oxide canisters.
She said retrieving the rubbish was something she “shouldn’t have to do”, but had been left with “no choice” with much of it left strewn outside her home.
The woman added that her lane had been “packed” with cars overnight, many of which departed before 9am.
Meanwhile, several people took to social media to complain of “thumping” music keeping them awake throughout the early hours of the morning.
They said it could be heard in towns and villages including Brandon, Weeting and Hockwold.
One person added they had heard the music from around 3.30am.
MORE: Secretive rave regular predicts many more illegal parties this summer
From Friday, police in England were given new powers to fine organisers of illegal gatherings of more than 30 people up to £10,000.
Those who attend gatherings, such as raves, and those who do not wear face coverings where it is mandatory can be given a £100 fine - doubling on each offence up to £3,200.
Earlier this month, Norfolk police broke up a rave attended by hundreds of people on land off the A1065 near Hilborough.
And ahead of the late August bank holiday weekend, the force urged members of the public to be “extra eyes and ears” to stop illegal gatherings.
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