Despite its popularity, horse racing is a dangerous sport for both horse and jockey. Last week, Churchill Downs—site of the Kentucky Derby—announced it would suspend racing operations for the rest of the spring after 12 horses died in a month. Operations will resume June 10 at Ellis Park in Henderson, Kentucky.

In its statement, Churchill Downs said “no single factor has been identified as a potential cause” of the deaths, but nearly all horses were euthanized after suffering serious injuries on the racetrack. During the suspension, investigators plan to conduct a “top-to-bottom review” of all safety protocols, including making sure the surface of the track is safe for racing.

“What has happened at our track is deeply upsetting and