Lt. Chris Cammock says firefighters put out flames just before midnight Thursday and the three were treated at Skagit Valley Hospital for burns to arms and faces.
A 2-liter soda bottle was filled with gas for the oil extraction process and something ignited the fumes. The blast shattered a window and damaged walls.
The apartment building was evacuated for two hours while a Washington State Patrol bomb squad made sure there were no more explosives. The Mount Vernon fire marshal closed five units surrounding the damaged apartment for an investigation.
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