Militant groups involved in violence include Hamas, Palestinian Islamic Jihad, Popular Front for the Liberation of Palestine (PFLP) and the al-Aqsa Martyrs' Brigades. They waged a high-intensity campaign of guerrilla warfare against Israeli military and civilian targets inside Israel and in the occupied territory, utilizing tactics such as ambushes, sniper attacks, and suicide bombings. Military equipment was mostly imported, while some light arms, hand grenades and explosive belts, assault rifles, and Qassam rockets were indigenously produced. They also increased use of remote-controlled landmines against Israeli armor, a tactic that was highly popular among the poorly armed groups. Car bombs were often used against "lightly hardened" targets such as Israeli armored jeeps and checkpoints. Also, more than 1,500 Palestinian drive-by shootings killed 75 people in only the first year of the Intifada.