Police have released an e-fit of a suspect who threatened a man with a needle in Bognor Regis.
The victim was approached by two men as he walked along Church Path at the side of Hotham Park at about 3pm on August 7.
They spoke to him briefly and then, as he continued out of the subway towards Upper Bognor Road/Parkside, they caught up with him on bikes.
One of them produced a needle, demanded the rings from his fingers and also took his rucksack.
They then rode off back down the alleyway towards the subway.
The first suspect was white, aged between 25 and 28, of slim to medium build, and between 5ft 7ins and 5ft 8ins, with a very short shaved blond or light brown hair.
He had bad skin with pockmarked face and chin and a tribal pattern tattoo on the bottom of his left forearm and wrist.
He was scruffy in appearance and wearing a black zip-up jacket of shell suit material and black tracksuit bottoms.
He was riding a red mountain bike and spoke with an eastern European accent.
The second man was also white, aged around 25 to 30, 6ft tall, of large, muscular broad build with very short cropped brown hair.
He had light brown stubble and tattoos on both forearms, possibly some form of writing.
He was wearing dark, possibly black tracksuit bottoms, a plain grey short-sleeved T-shirt and was riding a dirty BMX bike.
A Sussex Police spokesperson said: “We hope that by releasing this e-fit of the main offender it will jog someone’s memory or they may recognise the suspect.
“If anyone can assist police with their enquiries then we would ask them to call Sussex Police on 101 quoting serial 1042 of 07/08. Alternatively, call the independent charity Crimestoppers anonymously on 0800 555111.”