A teenage boy was taken to hospital after being attacked by a group of 10 people dressed in black and carrying knives.
Just before midnight on Wednesday, the boy was stabbed in the leg and hit on the head in Exeter Way in Thetford.
Emergency services were called to the scene and the teen was taken to West Suffolk Hospital by ambulance.
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He has since been released from hospital and is recovering.
Two men in their 20s have been arrested on suspicion of GBH and possession of an offensive weapon.
They are being interviewed at Bury St Edmunds Police Investigation Centre.
Detective Sergeant Mark Tate said: “We know this incident may have caused some concern in the community and we will be conducting reassurance patrols in the area.
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“Enquiries are continuing into the circumstances surrounding the incident and we would be keen to hear from anyone who can help with our investigation.”
Officers would like to hear from anyone who may have witnessed the incident or has any relevant information.
Anyone able to help should call 101 or email mark.tate@norfolk.police.uk, quoting reference 36/52338/24.
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