First deployed on the streets of Gaza in May 2006, Hamas's main security apparatus, initially dubbed the Executive Force, has grown from an estimated 3,000 members to more than 13,000, divided in several security branches. The core of the force is mostly members of the Hamas armed wing, the Izz el-Deen al-Qassam Brigades, but it includes some members from allied militant factions such as the Popular Resistance Committees. __
