DEL MAR, Calif. (AP) _ Three jockeys were injured and three horses were euthanized on the track Monday following a chain-reaction accident during the fourth race at Del Mar.

Jose Silva was taken by ambulance to Scripps Hospital in nearby La Jolla for X-rays after complaining of chest pains, track spokesman Mac McBride said.

Anthony Lovato was taken to another branch of Scripps Hospital, in Encinitas, for precautionary X-rays after complaining of lower back pain.

And Russell Baze broke his left foot and left big toe and was taken to the Del Mar Clinic.

``It was scary,'' McBride said. ``It was one of these chain reaction things, you have an incident, than another one, then another one. These things are happening in rapid-fire order.

``It's very unsettling. It's extremely unfortunate we lost three race horses. It could have been much, much worse. We have no loss of human life. We believe at this point the injuries to the five jockeys were minimal.''

The accident occurred on the far turn in the six-furlong claiming race for 3-year-olds and up.

Mr. Powerful, ridden by Lovato, stumbled and fell when he apparently broke his left front leg while moving into third place. Silva, on Jentzen, could not avoid the fallen horse and also fell, unseating Silva.

Two other trailing horses _ Kiss an Angel with Baze aboard and The Station with David Flores riding _ were steered clear of the fallen horse, but in the process stumbled and lost their riders.

The final trailing horse, Pacific Pride with apprentice jockey Mick Ruis up, also attempted to avoid the fallen horses but couldn't do so and fell.

Mr. Powerful, Jentzen and Pacific Price were put down on the track. Kiss an Angel and The Station apparently avoided serious injury.

Lovato, Flores, Baze and Ruis were able to walk into the track's first aid station on their own before Lovato and Baze were hospitalized.

The race was won by Spectacular Chance. The accident delayed the racing program for about 10 minutes.