An unoccupied fifth wheel trailer went up in flames in a Preston campground on Monday, Sept. 8.

The blaze, under investigation by the King County Fire Marshal, was reported at about 10:30 a.m. at the 90 block of 308th Avenue, in the Blue Sky RV Park.

The trailer that burned was a total loss, and the fire also damaged an adjacent trailer, Eastside Fire and Rescue Battalion Chief Greg Tryon said. The fire was reported by members of a construction crew at the site. Units from EFR and Fall City fire districts responded.