11 Israeli athletes during the 1972 Olympic Games. Palestinian violence against other Palestinians Fighting among rival Palestinian and Arab movements has played a crucial role in shaping Israel's security policy towards Palestinian militants, as well as in the Palestinian leadership's own policies. As early as the 1930s revolts in Palestine, Arab forces fought each other while also skirmishing with Zionist and British forces, and internal conflicts continue to the present day. During the Lebanese Civil War, Palestinian baathists broke from the Palestine Liberation Organization and allied with the Shia Amal Movement, fighting a bloody civil war that killed thousands of Palestinians. In the First Intifada, more than a thousand Palestinians were killed in a campaign initiated by the Palestine Liberation Organization to crack down on suspected Israeli security service informers and collaborators. The Palestinian Authority was strongly criticized for its treatment of alleged collaborators, rights groups complaining that those labeled collaborators were denied fair trials. According to a report released by the Palestinian Human Rights Monitoring Group, less than 45 percent of those killed were actually guilty of informing for Israel. In the Gaza Strip, Hamas officials have tortured and killed thousands of Fatah members and other Palestinians who oppose their rule. During the Battle of Gaza, more than 150 Palestinians died over a four-day period. The violence among Palestinians was described as a civil war by some commentators. By 2007, more than 600 Palestinian people had died during the struggle between Hamas and Fatah. International status As far as Israel is concerned, the jurisdiction of the Palestinian Authority is derived from the Oslo Accords, signed with the PLO, under which it acquired control over cities in the Palestinian territories (Area A) while the surrounding countryside came either under Israeli security and Palestinian civil administration (Area B) or complete Israeli civil administration (Area C). Israel has built additional highways to allow Israelis to traverse the area without entering Palestinian cities in Area A. The initial areas under Palestinian Authority control are diverse and non-contiguous. The areas have changed over time by subsequent negotiations, including Oslo II, Wye River and Sharm el-Sheik. According to Palestinians, the separated areas make it impossible to create a viable nation and fails to address Palestinian security needs; Israel has expressed no agreement to withdrawal from some Areas B, resulting in no reduction in the division of the Palestinian areas, and the institution of a safe