An 18-year-old man was injured in a seafront stabbing involving four teenagers.
Sussex Police received a report of three teenagers – one in possession of a knife – chasing another teenager along Marine Parade in Worthing, close to the junction with West Street, at about 13.17 BST on Wednesday.
The man suffered a hand injury and was tended to by members of the public before being taken to hospital.
Three suspects, described as white and wearing black hoodies, ran off in a westerly direction along Marine Parade, police said.