(Askeri) Blast Bomb is a term used in Northern Ireland for a type of improvised explosive device. More specifically, these devices are usually a form of homemade grenade, which is thrown at a target. These devices have been used in a number of public order situations, and in attacks on the Police Service of Northern Ireland (PSNI) and British Army. Ordinary fireworks are sometimes used in a similar fashion to blast bombs. Such devices which are packed with nails are referred to as nail bombs