It is reported that during a disturbance involving a group of people, a man was assaulted and suffered a head injury.
The incident happened at around 5pm on Thursday 3 June 2021 on the beach in Viking Bay.
He was treated at the scene by South East Coast Ambulance Service and the Coastguard, and was taken to a local hospital.
A 17-year-old boy was later arrested on suspicion of assault and taken into custody.
Detective Sergeant Claire Munday of Margate CID said: ‘There was a large number of people on the beach at the time of this incident and we are appealing for witnesses or anyone with information to call the appeal line.
‘We would also urge anybody who has footage of the disturbance to contact us as it may assist our investigation.’
Anyone with information is urged to call Kent Police on 01843 222289, quoting reference number 3-1100.
You can also contact the independent charity Crimestoppers anonymously by calling 0800 555111 or using the anonymous online form on their website.