Another horse died at Santa Anita Park Saturday after it sustained a leg injury during the final race of the Breeders' Cup. It is the 37th horse to die at the track since December amid mounting outrage and concern over horse safety at the track.The 4-year-old thoroughbred named Mongolian Groom suffered a "serious fracture" to his left hind limb and was later euthanized, officials confirmed.Breeders' Cup officials released the following statement, which reads in part:Officials added that they've hired a notable veterinarian to conduct an independent evaluation of the incident.The two-day event, known as the Super Bowl of horse racing, was under intense scrutiny after the death of 36 horses since December going into the race. Before Saturday's incident, the most recent death was announced less than one week ago when Bye Bye Beautiful injured its leg during a race and was euthanized.The track has made some changes to their procedures, such as cracking down on the use of riding crops and certain drugs, but animal rights activists continue to stage protests outside the park."We want to see an end to this vile blood sport," said Heather Wilson of the group Horseracing Wrongs.About a dozen demonstrators from the organization stood at the track's main entrance Friday. At the same time, on the other end of the track, people who work in the horse racing industry held a counter demonstration."There's 77,000 jobs up and down the state of California that are tied in to horse racing," horse trainer Doug O'Neill told Eyewitness News. "From the guy ripping the tickets, to the shoers putting on shoes, to the veterinarians. There's so many people tied in to this great sport."