A report on KSL.com says (http://bit.ly/VmxG8V) when fire crews first arrived on scene at around 1 a.m., the heat from the burning truck was causing propane tanks carried in its trailer to explode. The fire also set off boxes of .22-caliber ammunition stored in the truck.
"We try to keep safe and put the fire out from a distance," said Clinton Deputy Fire Chief Justin Benabides.
Firefighters believe the fire began when in a hot coal can that spread to a nearby garbage can, then to the truck and then the trailer, followed by the garage and back of the house.
Read more at http://bit.ly/VmxG8V.
For more information on the effects of fire on ammo, consider Firefighters Training: Video on Effects of Fire on Stored Ammunition .