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A man was taken to hospital after he and a woman were pushed into a river by someone thought to be on a bike.
Officers were called at 10.22am on Saturday after the incident in the River Darent at Lullingstone Country Park, Eynsford.
A man in his 60s was taken to a local hospital for treatment.
It is thought the attacker had been riding a bike prior to the incident.
Inquiries into the incident remain ongoing and anyone with any information is urged to call Kent Police on 01622 604100 quoting reference 01-0584.