<P> The concussive blast of the detonation can still injure, and the heat created can ignite flammable materials such as fuel . The fires that occurred during the Iranian Embassy siege in London were caused by stun grenades . </P> <P> British technical experts created the first "flash bang" or "stun" grenade for the Special Air Service's Counter terrorist wing . </P> <P> Unlike a fragmentation grenade, stun grenades are constructed with a casing made to remain intact during detonation, containing most of its explosive force and avoiding shrapnel injuries, while having large circular cutouts to allow the light and sound of the explosion through . The filler consists of a pyrotechnic metal - oxidant mix of magnesium or aluminum, and an oxidizer such as potassium perchlorate or potassium nitrate . </P> <P> Stun grenades are usually designed to be non-lethal and cause no damage to the target . However, permanent hearing loss has been reported . Also, other injuries and deaths have been officially attributed to their use . These include the following: </P>

When u get hit with a stun grenade