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DEL MAR, Calif. — A 3-year-old racehorse was euthanized after a training injury in Del Mar, the Del Mar Thoroughbred Club confirmed Monday.

The 3-year-old filly, Bri Bri, suffered a serious pelvis injury, officials said. They did not immediately clarify when the injury occurred.

“Del Mar has implemented a series of safety and welfare reforms over the last several racing seasons, including the creation of an independent five-member panel to review all entries,” the club said in a statement. The organization said they would be meeting with the horse’s trainer, Jim Cassidy, to discuss the incident.

“We are deeply sorry for her and her human connections,” the Thoroughbred Club statement read.

It’s the fourth horse death since the start of the summer meet.

On July 29, a three-year old filly broke down during training after a leg injury.

Two horses were killed July 18 in a freak accident when a two-year old threw his rider and collided head-on with a three-year old, also during a morning workout.

So far, there have been 171 races with no deaths.

We will update this developing story as we learn more.