DEL MAR, Calif. – Two unraced horses were killed and jockey Assael Espinoza was hospitalized after a collision during workouts early Thursday morning at Del Mar. Carson Valley, a 3-year-old trained by Bob Baffert, and Charge a Bunch, a 2-year-old trained by Carla Gaines, were involved in the accident, track officials said. Charge a Bunch unseated jockey Geovanni Franco on the backstretch and immediately reversed course, running into the first turn in a clockwise direction. The collision took place near the six-furlong pole, witnesses said. “It all happened so fast,” Baffert said. Espinoza complained of pain in his lower back and underwent a CAT scan at a local hospital, according to his agent, Brian Beach. Franco was not injured, said his agent, James Giannone. Gaines declined to discuss the incident Thursday morning. Carson Valley had completed a workout in company, a half-mile in 47.60 seconds from the gate, and was being pulled up when he was struck. The accident occurred after a safely run opening day on Wednesday and amid heightened concern about equine safety following the deaths of 30 horses in training and racing during the six-month Santa Anita meeting, which ended June 23. – additional reporting by Brad Free