Jockey JT McNamara is in an induced coma, suffering "a serious neck injury", after his horse fell at the first hurdle in the Fulke Walwyn Kim Muir Challenge Cup at Cheltenham this afternoon.
Dr Adrian McGoldrick, chief medical officer for the Irish Turf Club, said: "JT has suffered a serious neck injury.
"He is being looked after at the regional spinal unit but as yet he is still waiting for a scan.
"So what we know so far is that he has a neck injury, but we will know far more in the morning when hopefully he will have had his scan."
More top news
Remaining cold for most this weekend with the risk of ice overnight
Last-minute Christmas shoppers have also been warned to watch out for icy pavements as the cold snap continues.
A chip shop in Cullompton has created a special Christmas Dinner - completely deep fried in batter. But how does it taste?