Five police officers were injured and four people were arrested after an illegal rave in Holbeach St Marks.
Lincolnshire Police said they were made aware of an unlicensed music event taking part in a rural area of the village at around 4am on Sunday, September 20.
Around 200 people were at the event and officers engaged with some of those involved. They monitored the event through the night and it concluded by 3pm on Sunday.
Five officers suffered minor injuries and four people were arrested – two for violence and two for possession of drugs.
Detective Chief Superintendent Jon McAdam said in addition to having to manage the illegal rave, a number of their officers attending various incidents across the county were also assaulted over the weekend.
He said: “Our officers do not come to work to be assaulted. None of this is acceptable at any time, but during a national pandemic where we are seeing COVID-19 cases rising it is beyond words what people are actually thinking by organising and attending these events. Play your part and do not support such events.
“We all have a responsibility to do what we can do, to take the steps that are required to stop the transmission and to abide by regulations so we can prevent this disease moving further through the country.”
Recent changes to coronavirus regulations mean that the number of people that can attended social gatherings was restricted from 30 to six people.