One woman and a horse were killed in the Feb. 10 explosion at the Florida facility.

One woman and a horse were killed in the Feb. 10 explosion at the Florida facility.

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Report: Horse's Shoe Caused Fatal Explosion

One woman and a horse were killed in Feb. 10 explosion at Florida facility.

A Feb. 10 explosion at a hyperbaric oxygen chamber at a Florida equine facility that killed one woman and a horse was caused by contact from the horse’s steel shoe with the chamber.

In the report, the Marion County Sheriff’s Office concluded that the explosion at KESMARC Florida in Ocala, Fla., was an accident. The blast also injured a second woman.

Killed in the explosion was 28-year-old Erica Marshall, who was employed by KESMARC. Sorcha Moneley, 33, of London, England, who was at the facility to look at the oxygen chamber for possible future use in Europe, was injured during the accident.

According to the report, Moneley said the horse in the chamber had steel shoes on his hooves. He began kicking and knocked off a part of the chamber's protective padding, revealing a metal surface. When the horse kicked again, Moneley said, a spark was created when one of the steel shoes connected with the metal surface.

As Marshall attempted to return the chamber to normal pressure, Moneley left to call emergency personnel, the report said. As Moneley departed to call 911, according to the report, “she looked back and saw Erica staring at the monitor and crying.”

Moneley told the investigators she then heard two explosions in rapid succession. Moneley said the second explosion was much larger than the first. Moneley said she was about 20 feet away from the chamber when the explosion occurred and that the second one “knocked her down and took her breath away,” according to the report.

Moneley also said she "was aware that there were some problems with the valves on the chamber leaking” and that the facility manager was attempting to have the problem reviewed by an engineer.

According to the report, KESMARC manager Leonora Byrne said that Marshall had operated the chamber for two years.

KESMARC Florida in Ocala and Kentucky Equine Sports Medicine and Rehabilitation Center in Versailles, Ky., are not affiliated and have not been affiliated for about two years now, according to a spokeswoman.