UPDATE: Conditions of two people burned in RV explosion upgraded - KTTC Rochester, Austin, Mason City News, Weather and Sports

MAZEPPA, Minn. (KTTC) -- The conditions of two people burned in an explosion at a campground near Mazeppa have improved.

Jacob Harberts, 29, and Briana Wagner, 28, were listed in fair condition Tuesday at Regions Hospital in St. Paul.

Wabasha County authorities said the two were in a RV Sunday night when it caught fire at Mac's Park Place campground below the Lake Zumbro Dam.

The sheriff says the cause of the explosion is being ruled "accidental."

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MAZEPPA, Minn. (KTTC) -- An explosion and fire inside an RV at a campground near Mazeppa Sunday evening severely burned two people from Rochester.

Firefighters were called to Mac's Park Place campground near the Lake Zumbro Dam about 9:20 last night after an explosion caused a huge fire in an RV hooked up to a pickup truck.

Wabasha County Sheriff Rodney Bartsch says Jacob Harberts, 29, had been living there with Briana Wagner, 28, and that the sheriff says just prior to the blast there had been talk of them "making something on the cook stove."

Sheriff Bartsch says Harberts and Wagner have been taken to Regions Hospital in St. Paul with severe burns.  A spokesperson for Regions says they are both in critical condition.

The sheriff says the cause of the explosion is being ruled "accidental."