SPANAWAY, Wash. A man was found dead and a death investigation is underway after an explosion and fire destroyed a motorhome and damaged a second one and a garage in the Spanaway area, KOMO reports.

Shortly before 8 a.m., Pierce County deputies were in the 6400 block of 224th Street East on an unrelated call when they heard a loud explosion and spotted heavy smoke rising from a property in the distance, according to the Pierce County Sheriff's Office.

The deputies rushed to the property and found a large RV fully engulfed in flames. Central Pierce Fire & Rescue crews arrived and quickly knocked the fire down, KOMO reported.

The motorhome where the fire started was destroyed. A second motorhome and an adjacent garage sustained only minimal damage.

While firefighters searched for hot spots, they discovered a man dead inside the first motorhome, according to the sheriff's office. His cause of death is not yet known.

Pierce County Sheriff's Office detectives and the Pierce County Fire Marshal will handle the investigation, and the county medical examiner's office will determine how the man died, KOMO reported.