South Wales Police Officers were called at 7.45pm on Saturday, February 22, with a report that a man had been assaulted outside Judges on Market Street, Aberdare.
A 38-year-old man was taken to hospital as a result of his injuries.
Officers are continuing inquiries into the incident including checking CCTV footage.
Sergeant Gavin Harris said: “We are working hard to trace whoever is responsible and officers are following a number of lines of inquiry.
“Anyone who was in the area and has relevant information or footage please get in touch with us.
“We believe there were a number of witnesses to the incident, and we want to take their accounts of what happened.”
Please contact us by one of the means below quoting occurrence 2500058656.
Live Chat https://www.south-wales.police.uk/
Report Online https://www.south-wales.police.uk/ro/report
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Always call 999 in an emergency.
Information can also be given via Crimestoppers anonymously on 0800 555 111, or their online form at Give information | Crimestoppers (https://crimestoppers-uk.org/)