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A 53-year-old man is critical in hospital after a fight with a man on Edinburgh's Princes Street.

He was found injured near the Johnnie Walker building, at the west end of the city's main shopping street, just after 20:00 on Saturday.

He was taken to the Royal Infirmary of Edinburgh with a serious head injury.

Det Insp Keith Fairbairn said: "A man has been left seriously injured and it's imperative we trace whoever is responsible."

Police are checking CCTV footage.

Det Insp Fairbairn added: "We know that numerous people saw what happened and I am appealing to them to .

"Any small piece of information could prove vital in this investigation."