Four men assaulted a man of 19 in the alley behind the George Street sports centre in Bicester at 4am on Saturday.
Four males in their late teens wearing black hooded tops stole his wallet.
The first offender was black, 5ft 9ins tall, of medium build. The second was a slim, white, 6ft tall with a black peaked cap. The third was white, 6ft tal land stocky and wore a baseball cap with an A on the front. The fourth was white, 6ft tall and slim.
Call Pc Thorogood-Gates on 101.
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