Heather May, property manager at 253 North Street in Ellsworth, points to the top of former school bus where a local man was seriously injured on Tuesday, July 14, when a propane explosion set the bus on fire. The man had converted the bus into a mobile home. Credit: Sabrina Martin|BDN

A propane explosion in a bus converted into an RV left one person seriously injured Tuesday afternoon in Ellsworth.

The explosion happened about 3 p.m. off North Street, according to Shannon Moss, a spokesperson for the Maine Department of Public Safety.

The RV’s occupant was taken to Northern Light Maine Coast Hospital with serious burns, Moss said Wednesday morning.

Investigators believe the explosion happened under the propane range, likely ignited by the electric compressor motor from the nearby refrigerator.

It’s unclear where the gas leak originated. The RV was supplied by two 25-pound propane cylinders in its external rear compartment.

The blast remains under investigation.