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Teenage boys were "threatened with a broken bottle" after chasing another teen who stole a bag from their friend.
It happened near New Road, Gravesend, at about 2.10pm on Sunday, February 3.
A 15-year-old boy was allegedly robbed of his bag by another teenager, who then left the scene.
Two of the victim's friends caught up with the suspect shortly after, who is said to have assaulted them both, causing minor injuries.
He is then reported to have threatened them with a broken bottle, before chasing them away alongside a group of other young people.
Officers were called to the scene and arrested a 16-year-old boy in connection with the incident.
He has now been released from custody, pending further inquiries.
Witnesses are asked to call the appeal line on 01474 366 149 quoting reference 46/22521/19.
You can also call the independent charity Crimestoppers in Kent anonymously on 0800 555111.