An assassination attempt against King Hussein of Jordan precipitates the Black September crisis. September 3–6 – Israeli forces fight Palestinian guerillas in southern Lebanon September 4 – Chilean Socialist Senator Salvador Allende wins 36.2% of the vote in his run for presidency defeating former right-wing President Jorge Alessandri with 34.9% of the votes and Christian Democrat Radomiro Tomic with 27.8% of the votes. September 5 – Vietnam War: Operation Jefferson Glenn: The United States 101st Airborne Division and the South Vietnamese 1st Infantry Division initiate a new operation in Thua Thien Province (the operation ends in October 1971). September 6 – Dawson's Field hijackings, The Popular Front for the Liberation of Palestine hijacks four passenger aircraft from Pan Am, TWA and Swissair on flights to New York from Brussels, Frankfurt and Zürich and flies them to a desert airstrip in Jordan. September 7 – Fighting breaks out between Arab guerillas and government forces in Amman, Jordan. September 8–10 – The Jordanian government and Palestinian guerillas make repeated unsuccessful truces. September 9 – Guinea recognizes the German Democratic Republic. September 10 - Cambodian government forces break the siege of Kompong Tho after three months. September 15 – King Hussein of Jordan forms a military government with Muhammad Daoud as the prime minister. September 17 – "Black September": King Hussein of Jordan orders the Jordanian Armed Forces to oust Palestinian fedayeen from Jordan. September 19 – Kostas Georgakis, a Greek student of geology, sets himself ablaze in Matteotti Square in Genoa, Italy, as a protest against the dictatorial Greek junta led by Georgios Papadopoulos. September 20 Syrian armored forces cross the Jordanian border. Luna 16 lands on the Moon and lifts off the next day with samples, landing back on Earth September 24. September 21 – Palestinian armed forces reinforce guerillas in Irbidi, Jordan. September 22 The International Hydrographic Organization (IHO) is founded. Tunku Abdul Rahman resigns as prime minister of Malaysia, and is succeeded by his deputy Tun Abdul Razak. September 27 Richard Nixon begins a tour of Europe, visiting Italy, Yugoslavia, Spain, the United Kingdom and Ireland. Pope Paul VI names Saint Teresa of Ávila as the first female Doctor of the Church. September 28 – Vice President Anwar Sadat is named temporary president of Egypt following the death of Gamal Abdel Nasser. September 29 – In Berlin, Red Army Faction members rob three banks, with loot totaling over DM