Douglas County investigators believe an accidental spark from static electricity may have ignited a fire that led to multiple explosions at a propane gas retailer Thursday night. No injuries were reported in the blaze at Blossman Propane Gas and Appliance at 8905 Hwy. 5 in Douglasville. County government spokesman Rick Martin said firefighters returned to the scene this morning to investigate the cause of the fire that occurred after a propane explosion. "At this time all investigators agree that the fire appears to be accidental," Martin said.