Experienced amateur jockey Tom Weston has been airlifted to Southmead Hospital with injuries after his horse, Benbane Head, fell at the 14th fence in the Fulke Walwyn Kim Muir Handicap Chase.
He was attended on the course by doctors and medical personnel and then taken to Cheltenham Racecourse's medical centre before being airlifted to hospital - he was breathing and conscious at the time.
Lord Windermere has been confirmed as winner of the Cheltenham Gold Cup Chase after a stewards enquiry.
The horse was taken first past the post by jockey Davy Russell, beating On His Own to second.
The Giant Bolster took third, though Paul Nicholl's Silviniaco Conti failed to place.
Jockey Daryl Jacobs has been injured in a dramatic incident at the Cheltenham Fesitval.
Somerset trainer Paul Nicholl's horse appeared to be spooked by something as he was cantering to the start for the 2.40 race. The horse went through the rails and jockey Jacobs was thrown from the saddle and into a TV camera.
Initial reports suggest that Jacobs has injured his shoulder and leg. He is currently having medical treatment.
Cheltenham Festival's most successful jockey Ruby Walsh has suffered a bad fall and suspected fractured wrist in the day's first race.
The Irish jockey has been taken to hospital for X-rays and will now be unable to ride another race, including his mount in the Gold Cup.
Our cameras caught the scene this morning as the racecourse was shrouded in fog. It should all be clear by the time of the Gold Cup at 3.20
Cheltenham racecourse is normally the third busiest UK airport on Gold Cup day after Heathrow and Gatwick but thick fog has so far prevented any helicopter landing there this morning.
Somerset trainer Paul Nicholls flies the flag for the West Country in this afternoon's Cheltenham Gold Cup.
Nicholls has won the Gold Cup four times and today sends out Silvianiaco Conti for the big race. He is still looking for his first win at this year's Festival
The Cheltenham Festival concludes tomorrow and 17-time champion trainer Paul Nicholls has an excellent chance of winning the Gold Cup for a record-equalling fifth time. Our Sports Correspondent Matthias Kurth reports.
More of That, ridden by Barry Geraghty and trained by Jonjo O'Neill in Gloucestershire has won the World Hurdle at Cheltenham this afternoon.
The favourite. Annie Power, came in second
Prestbury Park is Jonjo O'Neill's local racecourse - he trains at Jackdaws Castle near Cheltenham.