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Two victims suffered facial injuries after they were assaulted with a hockey stick.
The pair were trying to stop a group attack in Westover Road, Broadstairs, but were pounced upon when they intervened.
Prior to the hockey stick assault, two other victims were attacked by the five-person group in Beacon Road at about 7pm last night.
Two 14-year-old boys from Margate and a 13-year-old boy from Broadstairs were arrested nearby on suspicion of assault.
Police also detained a 14-year-old girl and 34-year-old woman, both on suspicion of affray.
All five remain in custody.
Police were alerted to the behaviour of the group following a report of people causing damage to a fence in Beacon Road.
Witnesses of the attacks are asked to call 01843 222289, quoting reference 46/9579/18.