Due to Israel's defeat of Arab armies, the Palestinian leadership came to the conclusion that the Arab world was unable to challenge Israel militarily in open warfare. Simultaneously, the Palestinians drew lessons from movements and uprisings in Latin America, North Africa and Southeast Asia which led them to move away from guerilla warfare in rural areas towards terrorist attacks in urban environments with an international reach. This led to a series of aircraft hijackings, bombings and kidnappings which culminated in the killings of Israeli athletes during the 1972 Munich Olympic Games.