In the late 1960s, tensions between Palestinians and the Jordanian government increased greatly. In September 1970 a bloody military struggle was held between Jordan and the Palestinian armed organizations. King Hussein of Jordan was able to quell the Palestinian revolt. During the armed conflict, thousands of people were killed, the vast majority of whom were Palestinians. The fighting continued until July 1971 with the expulsion of the PLO to Lebanon. A large number of Palestinians immigrated to Lebanon after Black September and joined the tens of thousands of Palestinian refugees already there. The center of PLO activity then shifted to Lebanon, where they established bases to stage attacks on Israel and launch an international terror campaign, largely aimed at abducting airplanes. The 1969 Cairo agreement gave the Palestinians autonomy within the south of the country, increasing the Palestinian control of the area. The area controlled by the PLO became known by the international press and locals as "Fatahland", which created tensions with local Lebanese and contributed to the 1975–1990 Lebanese Civil War.