Horse collapses, dies at Del Mar

DEL MAR - A horse died during training at the Del Mar racetrack today, injuring jockey Victor Espinoza.

Kona Gold Stakes winner Bobby Abu Dhabi went into cardiac arrest on the track, owner Brian Trump tweeted around 10 a.m.

Espinoza, who won the 2015 Triple Crown on American Pharaoh, sustained fractured vertebrae and injuries to his neck and left arm, according to Jeff Furmanski, a spokesman for the Del Mar Thoroughbred Club.

The Hall of Fame jockey was being treated at Scripps Memorial Hospital La Jolla, where he will remain overnight, Furmanski said.

Trump, the owner, tweeted: "While we are deeply saddened and heartbroken by this loss our thoughts are currently with HOF jockey @VictorEspinoza.

"Please keep him in your prayers."