A concrete bomb is an aerial bomb which contains dense, inert material (typically concrete) instead of explosive. The target is destroyed using the kinetic energy of the falling bomb. Such weapons can only practically be deployed when configured as a laser-guided bomb or other form of smart bomb, as a direct hit on a small target is required to cause significant damage. They are typically used to destroy military vehicles and artillery pieces in urban areas, in order to minimise collateral damage and civilian casualties.