A man in his 60s was "punched in the face and repeatedly kicked" during a robbery in Falmouth, police have said.
Officers were called to Basset Street at about 21:30 on Friday, 7 June.
The man was attacked by a group of people as he was walking along the road carrying his shopping - which was stolen.
At the time of the incident, a small white van was seen turning from Basset Street into Penwerris Terrace.
Devon and Cornwall Police is appealing for the occupants of the white van to come forward.
An 18-year-old man has been arrested on suspicion of robbery and has been released on police bail until 16 July.
A 17-year-old boy, a 16-year-old girl, and a 28-year-old man have been arrested on suspicion of robbery and have been released under police investigation.
Anyone with information is asked to contact police via 101.