The Gloucestershire gendarmerie told the Palestinian Authority it had responded to calls involving “large numbers” of people in the area.
“Police are currently in the Forest of Dean near the speculation parking lot dispersing a rave.
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“People are advised not to go to the area for reasons of security and Covid risks,” they tweeted around 4 a.m.
Officers said it “would likely take some time” to resolve the incident.
A force spokesperson later said the operation was “relatively successful” and “was coming to an end”.
No details of the arrests were given.
Gloucestershire Police have urged those with information about the rave to call them on 101 citing incident 266.
UK police have fought to stop raves during the pandemic. More than 500 illegal parties were organized in London in July, according to the Metropolitan Police.
Last month, police in Avon and Somerset were unable to stop a rave in which more than 3,000 people took part in Bath because the risks were “too great”. The dancing party was so loud that residents of Bristol, five miles away, could hear the noise all night long.
In June, two Greater Manchester celebrations brought together a total of 6,000 people. An 18-year-old woman was raped and three people were stabbed in an event, while a 20-year-old man died of an alleged drug overdose at the rave across town.
Gatherings of more than 30 people are prohibited under coronavirus restrictions in England, with exceptions for specific events following public health rules.