Four arrests were made following an illegal rave in the Lynford area, near Thetford, last weekend, which 400 people are thought to have attended.
The event is believed to have got under way at around midnight on Saturday, with about 200 vehicles parked up when police arrived in the early hours of Sunday morning.
Officers blocked access points and made efforts to contain the site at ‘fire-ride 40’, in the Grimes Graves area of the forest, with a police helicopter used to monitor the incident and gather evidence.
They stopped the event at about 12.30pm, seizing sound equipment, speakers, turn-tables and vehicles.
Four arrests were made concerning organising the event and possession with intent to supply drugs.
Superintendent Stuart Gunn said: “It continues to be disappointing that people who attend such raves believe that it is acceptable to trespass, cause disruption and damage the forest.
“Those attending this event showed a complete disregard for road safety, the flora and fauna of the forest, residents in the local community, as well a lack of concern for their own safety.
“During the course of the night, officers monitored the incident and did what was possible in the circumstances to maintain road safety and limit damage to the land.”
A 25-year-old Thetford man, arrested on suspicion of supplying drugs, was released on police bail pending further inquiries.
A 27-year-old Wymondham man and a 20-year-old Attleborough woman were given cautions for failing to leave land, while no further action is to be taken against a 22-year-old Attleborough man, originally arrested on suspicion of organising a rave.