Police say they were assaulted as they attempted to separate an illicit rave at a stockroom close to Bristol.
Officials who were called to Yate at around 22:30 GMT on Saturday said up to 700 individuals were there.
A portion of the group started acting viciously towards officials and tossed objects when they were advised to leave, Avon and Somerset Police said.
The site was cleared by Sunday evening after eight individuals had been captured and music gear seized.
A power representative said when officials showed up they “found various vehicles and a few hundred individuals” at the site.
“Streets moving toward the region were shut to forestall more individuals arriving at the site via vehicle, yet huge quantities of individuals kept on showing up by walking from a few unique bearings,” he said.
- The representative said a few people got threatening towards the police.
- “Things, including lit shower jars and jugs, were tossed at police, some of whom were harmed however stayed on the job,” he said.
Mains power was sliced to the structure, yet an elective source was being utilized the representative said.
The eight individuals captured remember a man for his 30s who was hung on doubt of being engaged with arranging the function.
Ch Insp Mark Runacres said it was a “testing activity” with “countless individuals in a restricted space and a few officials being attacked”..
“Our examinations group will be engaged with looking into officials’ body worn film and different requests as we try to make suitable move against those mindful,” he said.