NASHVILLE, Tenn. (AP) -- Federal and state arson investigators are trying to determine what caused a fire and explosion at a Nashville ammunition store that killed the shop's owner.

The Associated Press reported that firefighters discovered the body of 42-year-old Kenedy Rojas inside the Well Done Bullets store while responding to Monday's blaze. Officials said Rojas died from smoke inhalation and severe burns, and an autopsy showed no signs of foul play.

The Bureau of Alcohol, Tobacco, Firearms and Explosives said Rojas was licensed to sell and import firearms but not to manufacture ammunition. However, police said the owner was known to keep gunpowder containers in the shop for reloading ammunition.

Firefighters heard several small explosions at the shop while responding to the blaze at an office complex. The complex nearly burned to the ground.

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