Officers are appealing for information after a teenager was assaulted during a robbery while walking along High Road in Swaythling.
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It happened between 7pm and 7.30pm on Saturday (July 8) near the junction with Fleming Road.
Police say a 17-year-old boy was punched, causing him to fall to the ground where he was further assaulted.
After the assault the he noticed that his mobile phone had been stolen.
The victim suffered swelling and bruising to both eyes, as well as a cut below his eye which requires stitches.
PC Morgan Winstanley, said: “We believe a member of the community disturbed the offenders causing them to flee the scene. If you are this person, or if you witnessed this incident, please contact us as soon as possible.
“We believe more than one offender was involved in this incident. Anyone with any information about who may be responsible is asked to contact us as soon as possible.”
Anyone with information is asked to contact us quoting incident number 44230274861. You can report online via the link below, or contact us on 101. Alternatively, you can contact independent charity Crimestoppers anonymously on 0800 555 111 or via their website.