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A teenager was taken to hospital with a head injury after being attacked with a branch of wood.
Officers were called to Lowfield Street, in Dartford, to reports a group of youths were allegedly assaulting another youngster.
They carried out a search in the area but the gang had already left by the time they arrived.
Paramedics also attended and a teenage boy was taken to hospital for treatment to a minor head injury.
A second person was also reported to have been assaulted resulting in a minor arm injury.
They are both believed to have been attacked with branches of wood on Monday, April 10, at around 2pm.
A police spokesman said: "Officers continue to provide a visible policing presence in the area, and inquiries are ongoing to ascertain the circumstances surrounding the incident."
Anyone who witnessed the incident or who has information is asked to call the police appeal line on 01474 366149 quoting reference 46/64689/23.
You can also contact Crimestoppers anonymously on 0800 555111 or by using the online form on their website.