Champion jockey Oisin Murphy has been taken to hospital after suffering a face injury following a pre-race fall in Salisbury.
Murphy was in the paddock on his Mount Oasis gift when the horse broke loose and took off.
Completely out of control, Murphy was helpless as the horse swung away and sent him flying through a plastic rail.
Dramatic footage was shown on racing TV, showing emergency personnel running towards Murphy.
Racing TV host Lydia Hislop, who was trackside, said: “Oisin Murphy got to his feet and slowly walked into the emergency ambulance.
“He was attended to within seconds at the racecourse by medics, who sat next to him.
“He was probably in shock for quite some time.
“He is now in the ambulance and the horse he was due to ride, the Oasis Gift, has been taken back.
“It was a horrific incident and really frightening for everyone involved.
“I have seen some horrific incidents in the frog but it was one of the most horrifying.”
Sky Sports Racing host John Hunt tweeted: “His condition is hard to be sure, but Oisin Murphy has gone to the ambulance, which is now possibly going to the hospital.
“He was thrown into the rigid railing around the parade ring in Salisbury and was initially treated for a facial injury.
“Although aware and mobile.”
Murphy has a ride at Sunday’s Arc de Triomphe – Europe’s richest race – on the Chrono Genesis.
Connection and Murphy will be hoping that any injuries are superficial and will not stop them from riding in Paris.
It was later confirmed that he had been taken to the hospital.
Oasis Gift, who was making his racecourse debut and is coached by Andrew Balding, was caught and was not injured.
Balding later told Racing TV that Murphy was conscious when he spoke to him, but that he would need stitches for his cleft lip.
Murphy was replaced on two of his other rides in Salisbury before traveling to France for the Ark.