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The apparent unprovoked assault happened about 2.45am on Saturday outside Rodgers House at the intersection of Princes and Dowling Sts.
The victim was taken to hospital in a serious condition.
Police said today they wanted would like to hear from the men shown in the photos, or from anyone who could identify them.
- Contact Police on 105 quoting file number 191012/7494, or call Crimestoppers anonymously on 0800 555 111.