Izz ad-Din al-Qassam Brigades
The Qassam rocket ( "Ṣārūkh al-Qassām"; also "Kassam") is a simple, steel artillery rocket developed and deployed by the Izz ad-Din al-Qassam Brigades, the military arm of Hamas. These rockets cannot be fired to target specific military objectives in or near civilian areas, and are "indiscriminate when used against targets in population centers".