An RV exploded at the Mississippi State Fairgrounds on Saturday evening.
Witnesses reported smelling propane just before the explosion about 4:35 p.m.
The Jackson fire department responded to the scene.
Chief Arson Investigator Greg Travis says it is believed a build-up of propane inside the RV sparked the explosion. However, the State Fire Marshal's office is handling the investigation.
No one was inside the RV at the time, but two dogs were rescued. The K9's were not injured.
A number of witnesses helped extinguished the flames before firefighters arrived.
The State Fair Commission says the Louisiana couple that owned the RV were in Jackson to watch their daughter compete in a barrel racing competition.
The family is being assisted with a place to stay and an area to store their horses.
This is the first known explosion at the state fairgrounds during an event.
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