A 20-year-old man suffered a fractured eye socket after allegedly being punched in the face during an argument near a bar in Chelmsford.
The alleged assault happened between 2.30am and 3am on Thursday in Springfield Road close to the Missoula bar.
Police have published a picture of a man they want to speak to in connection with the assault.
Pc Karyn Daniels said: “The man in this picture has been identified as a possible suspect in this assault and we need to interview him urgently.
“If anyone knows who he is then I would ask them to contact me at Chelmsford Police Station on 101.
“Alternatively I would urge the man to come forward and speak to us himself.”
Anyone with information can also call Crimestoppers anonymously on 0800 555 111.
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