Six people were injured when a runaway horse broke free from a California equestrian center Saturday.
Onlookers report seeing multiple horses running, likely the result of horses within a nearby riding group reacting to the incident.
It is unclear what initially spooked the horse but onlookers say it may have been noises coming from nearby tractors.
Six people were treated for minor injuries, including a wrist sprain.
Stable owners say it's not the horses' faults -- and that things like this 'just happen.'