Firearm Fighters' Latest Panic over Ammo Stored in Garages

Firefighters face exploding ammunition in garage fire | fire, costa, department, mesa, firefighters - News - OCRegister.com.

[from comments:]

When cartridges are placed in a fire he confirms that the most dangerous component of a cartridge is the brass, or fragments thereof that may cause eye injury or penetrate skin, but certainly there is no evidence that a cartridge that is not in a firearm can cause a mortal wound, either by action of the bullet or the brass/primer fragments. It is important to remember however that a chambered cartridge that detonates in a fire is just as dangerous as a cartridge that is fired under normal circumstances in a firearm.