A man has been stabbed in the head, chest and arms in a seafront park.
The man, in his 20s, was attacked in Marine Park Gardens, Bogor Regis at about 17:35 GMT on Sunday.
He was found “bleeding quite heavily” and taken to hospital, a spokesman for Sussex Police said. His attacker fled the scene.
A 23-year-old man from Barnet in London has been arrested on suspicion of attempted murder. Anyone who saw the attack is asked to contact the police.