Fire destroyed a vacant building late Wednesday night in Dallas County. The Conway Fire Department reports that firefighters responded to the area of Cardinal Road in Dallas County for home and vehicles on fire. Upon the arrival of the first units, they found the structure to be completely burnt to the ground and 3 vehicles involved along with a small grass fire. During fire fighting operations we were notified of a male subject in the area armed with a weapon possibly involved with this fire. MSHP Troop D, Dallas County Sheriffs, and the Missouri State Fire Marshall quickly responded and took that suspect into custody. At this time that investigation is ongoing and inquiries should be made to one of the above agencies. At no time were any fire personnel in danger from this suspect. Fire crews from Lebanon Rural Fire Protection District, Niangua Volunteer Fire Department, Marshfield Fire Department, & Hazelgreen Rural Fire Protection District responded to assist. No injuries were reported and we believe the structure to have been vacant.