A Grinnell company caught fire overnight.
It happened at the Grinnell Implement Store on Sixth Avenue shortly after 1 a.m. Friday.
Investigators say it started in a storage shed where several oil cans and propane tanks were stored. Several of the canisters exploded during the fire.
Damage is estimated at $500,000.
No one was injured and investigators are still looking for the cause.
The store is still open for business.