A man was seriously injured in Edinburgh city centre after being attacked by three balaclava-clad men.
The 20-year-old was attacked with a weapon by the three men after leaving a pub at around 12.05am on Friday 21 April.
The incident happened on Main Street in the Davidson Mains area of the city.
The victim was taken by ambulance to the Royal Infirmary of Edinburgh.
Enquiries have established that a dark-coloured 4×4, possibly a Range Rover, a smaller light-coloured car, and another light-coloured vehicle were spotted driving from nearby Quality Street onto Main Street at around 12.01am.
A cyclist was also seen travelling from Cramond Road to Quality Street and back again at around the same time.
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Detective Inspector Kevin Tait said: “None of these vehicles were involved in the attack but they passed the area shortly before or while the incident was ongoing.
“The occupants may have information which could help our investigation so if this was you please get in touch and speak to our officers.”