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LEBANON, Maine (NEWS CENTER) -- A propane tank explosion at the Salmon Falls River Camping Resort in Lebanon Saturday morningleft two people with serious injuries.

Fire investigators say a propane tank that was attached to a camper exploded, setting the camper on fire just before 8:00 A.M. Saturday.Officials saya 62-year-old woman and a 61-year-old manwere inside at the time. They were able to get out of the camper, but both had burn injuries. One was taken by LifeFlight helicopter to Maine Medical Center in Portland.

The identities of the victims have not been released, but investigators say they are from Missouri and had arrived at the campground Friday.

The State Fire Marshal's Office is investigating what caused the tank to explode, but investigators say it appears to be accidental.