This happened today and is a town to our south. The owner was on TV tonight saying it was a wood stove that caused it. A wood stove low to the ground in a service station full of volatile fumes. Of course this is a small town and no codes for stove installations.
http://www.kmeg.com/global/story.asp?s=9534170
http://www.kmeg.com/global/story.asp?s=9534170