Crystal Falls, MI- A trailer explosion on Friday sent a Wisconsin man to the hospital.Around 8:30 p.m. Friday, Richard Niemi entered his trailer and when he turned on the light, the trailer exploded and sent him and his dog flying.

Niemi was taken to Iron County General Hospital and later flown to the Milwaukee Burn Center for treatment.His dog was not injured.Authorities believe a build up of propane was the cause, but the investigation is continuing.