Police have been attempting to trace a man seen leaving a Glasgow pub shortly after CS gas was released, injuring three women.
The incident happened at this Glasgow bar
Officers were studying CCTV footage of the incident at Frankenstein's bar in West George Street.
Emergency crews were called to the premises at 0124 BST on Friday.
The women, aged 21, 22 and 29, were released after receiving treatment. One officer described the act as "totally irresponsible".
The CCTV tape showed a man walking from the toilets and spraying the gas in the air.
He then moved to another part of the pub and sprayed the gas again before leaving the city centre premises.
Drinkers were slow to react but as the gas was circulated by air conditioning they began to complain of stinging eyes.
Strathclyde Police described the suspect as a
white male, in his mid to late 20s, with short, dark coloured hair.
He was of slim to medium build, about 5ft 8in tall and was wearing a white short sleeved shirt with light checks, denims and black shoes.
Detective Constable Allan MacInnes said: "I am anxious to speak to anyone who witnessed the man spraying the substance, and who has not yet been interviewed, to come forward.
"This was a totally irresponsible act that could have had more serious consequences.
"I would urge anyone who recognises the description or has any information which may assist in this investigation to call us on 0141 532 3000."