An explosive device is a device that is designed to cause destruction or damage through the use of an explosive material. Common examples of explosive devices include mines, grenades, caps, bombs, petards, landmines, smokebombs, and letterbombs. Mines are small explosive devices that are typically buried underground and detonated when triggered by a person or vehicle. Grenades are small hand-thrown explosive devices that are designed to be thrown at a target and then explode. Caps are small explosive devices that are used to ignite other explosives. Bombs are larger explosive devices that are designed to cause widespread destruction. Petards are explosive devices that are used to breach walls or doors. Landmines are explosive devices that are placed in the ground and detonated when triggered by a person or vehicle. Smokebombs are explosive devices that are designed to create a smokescreen. Letterbombs are explosive devices that are sent through the mail and are designed to detonate when opened.