Police in Halifax are appealing for two people who came to the aid of an 18-year-old who had been robbed to come forward.
The robbery happened on Queens Road between 1.20 am and 1.35am on Sunday, October 13.
The male victim was chased down Hanson Lane until he reached Queens Road where he had a mobile phone stolen.
Two men, aged 17, have been charged with robbery.
Two females described as Asian came to his assistance and officers are keen to speak to them. They are also keen to speak to anyone else who witnessed the incident or were in the area at the time.
The two females are asked to contact DC Louise Halliwell on 101