A man is fighting for his life after being found suffering from a serious head injury near a city centre pub.
Police said it is unclear whether the 47-year-old found injured in Glasgow was assaulted or fell.
At around 9pm on Tuesday he was found unconscious on the south footpath in the Trongate near to the Tolbooth Bar in the Saltmarket.
He was taken to Glasgow Royal Infirmary where his condition is described as critical.
Detective Inspector Jim Bradley, of the City Centre Police office, said: "At this time, we are trying to establish how this man came about his injuries. It is unclear whether he fell or was the victim of an assault.
"I would appeal to the two men who assisted him. Apparently they tendered first aid and put him in the recovery position before leaving the scene. I would also like to speak to a bus driver who flagged down a passing ambulance. It is believed that the man had been in the Lamp Post public bar earlier in the evening and was headed for the Empire Bar although it is unknown whether he went in there.
"It is also understood that he may have been in bars in the Saltmarket area between 4pm and 9pm and I am anxious to speak to anyone who recognises the description and saw him last night."
Police said the man is around 6ft, has salt and pepper grey hair and is clean shaven. He was wearing a black jacket, white top, jeans and brown boots at the time he was found.
Anyone with information is asked to call the CID at City Centre Police on telephone number 0141 532 3055.
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