Police are appealing for witnesses after a 23-year-old man was threatened with a knife on Brighton beach on Thursday (21 May).
The victim managed to get away and no one suffered any injuries.
Detective Constable Rachel Piggott said: “We would like to speak to anyone who saw the incident and may be able to help us with our investigation.”
Two men, both aged 18, and two boys, aged 16 and 17, all from Brighton, have been arrested on suspicion of attempted robbery. They have been questioned and released on bail until Friday 3 July.
Any witnessed or anyone with information about the incident is asked to email firstname.lastname@example.org or call 101 quoting serial 529 of 21/05. Alternatively, call the independent charity Crimestoppers anonymously on 0800 555 111.