A young man was threatened with a knife after being confronted by six people riding electric bikes in Swindon.
The victim was walking along Akers Way towards Cheney Manor Industrial Estate when he was approached by the group between 8pm and 8.20pm on Monday 5 October.
Police said the six suspects were riding three Surron electric bikes and demanded the 19-year-old hand over his phone and chain.
When he refused, one of the suspects produced a knife.
One of those involved has been described as a white male, approximately 6ft tall, believed to be in his late teens or early 20s.
Wiltshire Police has been carrying out enquiries to identify those responsible and is now seeking information from the public.
Officers are particularly keen to hear from anyone who was in the area at the time and may have captured dashcam footage.
Anyone with information should call Wiltshire Police on 101, quoting crime reference number 54260120528.
Alternatively, email PC Giddings at [email protected] or contact Crimestoppers anonymously on 0800 555 111.
