Another racehorse dies after an injury at Santa Anita Park

Horses exercise during a morning training session at Santa Anita Park in April.

(CNN)An unraced horse named Derby River was injured in training Thursday at Santa Anita Park and became the 27th horse to be euthanized since the start of the racing season in late December at the famed California racetrack.

A spokesman for the California Horse Racing Board, Mike Marten, said veterinarians at an equine hospital in Chino determined surgery was not a viable option.
The horse was galloping during a morning training session at the track in Arcadia when it was injured, the board said.