Four men have been released on police bail following an illegal rave in Thetford.
Two men, aged 21 and 23, from Waltham Cross, and a 21-year-old man from Wisbech were bailed until November 15, and a 23-year-old man from Bury St Edmunds was bailed until October 17.
Police were tipped off just before 7am on Sunday and made a number of arrests and seized a substantial amount of sound equipment. It is thought the rave had been going on all night and about 200 people were involved.
Following the arrests, Superintendent Paul Sanford said: 'Events such as these will not be tolerated in the county.
'We will continue to take positive action whenever possible when future unlicensed music events take place.'
A police spokesman said: 'Police would like to take this opportunity to re-appeal to landowners and the general public to remain vigilant and to immediately report any incursions onto property by people who may be intent on holding a rave.'
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