Two racehorses have died in an accident at Belmont Park racetrack in New York.

The horses collided with each other on the training track on Saturday morning (4 January) at about 8am.

Caixa Eletronica, who won 23 times in his career, was galloping when he crashed with Six Drivers, who was loose after unseating his rider.

The 4-year-old Six Drivers reportedly threw his rider and galloped into a group of horses coming in the opposite direction.

Both horses died instantly. 9-year-old Caixa Eletronica suffered a fractured skull. Six Drivers broke his neck.

“He’s a barn favourite,” Caixa Eletronica’s trainer Todd Pletcher told US press.

“To me he was everything that was good about the game. You take a horse from a modest beginning and literally get to the pinnacle of racing. He showed up every time. It’s just heartbreaking.”

Caixa Eletronica’s rider Carlos Castro suffered a broken pelvis.