OCALA, Fla. (AP) - An explosion at an equine rehabilitation center in north Florida's horse country has killed a worker and a horse.
    
The explosion Friday at the Kesmarc Equine Rehabilitation Center in Marion County killed 28-year-old Erica Marshall. Another worker was airlifted to Shands Hospital in Gainesville with serious injuries.
    
The Marion County Sheriff's Office reports that the workers were in a high-oxygen chamber with the horse as part of the animal's rehabilitation. Something caused a spark, which then triggered the explosion.
    
State and local fire officials are investigating the cause.

(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)