A man handed over his rings to robbers after they threatened him with a needle.
The victim was approached by two tattooed men in an alleyway near Hotham Park, Bognor at about 3pm on Tuesday.
After a brief conversation the two men before walking away only for the men to return moments later on bikes and armed with a hyperdemic needle.
After demanding the man hand over his rings and his rucksack they then escaped back down the alleyway away from Upper Bognor Road.
The first suspect was white, between 25 and 28, a very short shaved blond or light brown hair and spoke with an eastern European accent.