The British Horseracing Authority says a horse that collapsed on the racecourse after running in the Grand National has died.

Celebre D’Allen, who had led the field, had needed lengthy veterinary treatment after collapsing after being pulled up in the big race at Aintree on Saturday

Nick Rockett, a 33-1 shot ridden by Patrick Mullins, won the Grand National steeplechase at Aintree on Saturday in a top three sweep for horses trained by the Irish amateur jockey's father Willie.