Ten people including three police officers were taken to hospital after a chemical attack outside a pub in Leicestershire in the early hours of Sunday.
A substance believed to be ammonia was sprayed during a mass brawl in which a group armed with baseball bats damaged The Cricketers pub in Aylestone, a suburb of Leicester.
Ten people were checked over for chemical-related injuries at Leicester Royal Infirmary and all were later discharged.
Five people were arrested over the incident. Two men aged 53 and 43 were held on suspicion of causing ABH, a 22-year-old man was arrested on suspicion of a public order offence and a 29-year-old woman was arrested on suspicion of criminal damage. A boy aged 15 was held on suspicion of possessing an offensive weapon.