A man suffered serious head injuries following an assault near Thirsk Industrial Estate.
It happened at around 5.35pm on Monday.
The victim was walking along York Road when he was assaulted near the second junction, heading out of Thirsk, that leads to the industrial estate.
Officers came across the man, who is local and aged in his 30s, laid on the pavement with serious head injuries.
He was airlifted to James Cook Hospital where he remains in a critical condition.
Officers are treating the incident as an assault and are appealing for witnesses and dashcam footage from anyone who was in the area at the time, including the moments before the incident.
If you saw, or have any dash-cam footage of either the victim, who was wearing light coloured trousers and a black jacket or another man, described as muscular and wearing a grey hooded top and tracksuit trousers who was walking towards the industrial estate, or if you witnessed the assault itself please get in touch.
If you can assist the investigation, please call North Yorkshire Police on 101, select option 2 and ask for Northallerton CID or email Amy.Beveridge@northyorkshire.police.uk
If you wish to remain anonymous, you can pass information to Crimestoppers on 0800 555 111.
Please quote reference 12210233396 when passing on information.
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