Police searching for this man after brutal attack on New Year's Day in Leeds
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It happened just after 1am on New Year's Day on Albion Street.
A 22-year-old victim suffered a broken jaw after being punched in the face, in what police have called an "unprovoked" attack.
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Hide AdOfficers are now looking to identify a white man with dark hair, pictured, in connection with the assault.
West Yorkshire Police posted the images on Twitter and said: "No 'Happy New Year' from this one!
"We want to speak to him over an unprovoked attack, early hours of Jan 1 in Leeds, that left another man with a broken jaw.
"Images not the best but hoping someone will know him."
Anyone who recognises the suspect or who has any information should call Leeds District CID via 101 quoting crime reference 13200001090 or online via the livechat.
Information can also be given anonymously to the independent charity Crimestoppers on 0800 555 111.