Police are appealing for witnesses after a woman in her 50s was injured during an assault at the Coach and Horses pub on St Catherine Street, Gloucester, in the early hours of Sunday 7 September.
Officers were called at around 12.20am following reports that the woman had been struck in the head by another woman, leaving her with injuries to her head, back and wrist.
A 39-year-old woman was arrested on suspicion of common assault and later released under investigation while enquiries continue.
Police are urging anyone who was in the pub at the time — or who has mobile phone footage of the incident — to come forward.
Information can be submitted via the Gloucestershire Constabulary website, quoting incident 241 of 26 September.