A 20-year-old man was slapped and mugged of his mobile phone and £1.50.
The crime happened in an alley between Bartlemas Close and Herbert Close, Oxford, between 10.30pm and 11pm on Saturday.
The man was surrounded by three robbers who were described as black. Two wore dark clothes.
Police are looking into whether the crime is linked to the robbery of an 18-year-old man the same night in Princes Street.
Call 101 with information.
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