A Feb. 5 fire in a barn at Eureka Downs in Eureka, Kan., killed 43 horses and remained under investigation as of Feb. 6, officials said.

Both Thoroughbreds and Quarter Horses, most of which were 2-year-olds in training, were killed. Eureka firefighters said the cause of the fire is under investigation by the Kansas fire marshal.

One horse, 5-year-old Smart Effort, escaped the blaze. “It burned 25% of his body on his right side and singed his hair off, but they think he will make it,” said Eugene Ralston, a member of the board of directors of the Kansas Quarter Horse Association.

Ralston also said one trainer lost 23 horses–his entire stable–in the fire