Gwent Police say they received a report of a collision on Lansbury Park Road, Caerphilly, at around 8.20am on Thursday.

Parts of North and Mid Wales have seen heavy snowfall after wintry weather reached South Wales earlier in the week.

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Paramedics from the Welsh Ambulance Service and the Wales Air Ambulance attended the crash involving a gritting vehicle and the boy.

He is being treated in hospital and his injuries are thought to be life-threatening, police say.

The 36-year-old man who was driving the gritter was arrested on suspicion of causing serious injury by driving without due care and attention.

He has since been released as the police continue their investigation.

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The Welsh Ambulance Service confirmed they were called shortly before 8.15am.

A spokesperson said: "We sent one rapid response vehicle and one emergency ambulance to the scene where we were supported by the Emergency Medical Retrieval and Transfer Service.

"One person was taken to University Hospital of Wales, Cardiff for further treatment."

Police are appealing for anyone who may have witnessed the collision - or anyone with dashcam footage who was travelling on Lansbury Park Road between 8am and 8.30am on Thursday, 9 March - to get in touch with them.