Two investigators from the State Fire Marshal's office were at Superior Truck and Auto Service Wednesday, investigating a blaze that broke out Sunday afternoon.
Eastern Fire Chief Chris Drennan told KTVO those investigators suspect the cause of Sunday's fire was a fan motor on a natural gas furnace.
The fire caused an estimated $750,000 dollars in damage.
Two large metal buildings owned by GSG Enterprises LLC were destroyed.
They were leased by Chad and Mackenzie Sampson of Kirksville, the owners of Superior Truck and Auto Service.
The flames destroyed semi-trucks, tractors and all kinds of repair equipment, luckily the business was closed at the time of the fire and no one was hurt.
Fire fighters were called to a structure fire south of Kirksville on Sunday.
The chief of the eastern fire district told KTVO the Adair County Fire Department was paged around 2:30 p.m. to the scene of a two building fire at Superior Trucking.
Upon arrival, the buildings were fully engulfed in flames. Smoke also crossed Highway 63 which slowed up traffic for a short period.
Fire fighters called surrounding stations for help getting the fire under control. Our crews spoke with Chief Chris Drennan just after 4 p.m. and he says fire fighters were still working.
??It's not completely out right now, but we've got it knocked down to where it's manageable. We??re going to have to get some heavy equipment in here to take out some of the walls to get the fire completely out,?? says Drennan.
There have been no reports of any injuries due to the fire.