Jewish leaders. UTA Flight 772 explodes over Niger, killing all 171 people on board (the Islamic Jihad Organization claims responsibility). Burkinabé ministers Jean-Baptiste Boukary Lingani and Henri Zongo executed following their arrest the previous day. September 20 – F. W. de Klerk is sworn in as the seventh and last State President of South Africa. Soon afterwards he determines to suspend the South African nuclear weapons program. September 22 1989 Deal barracks bombing: An IRA bomb explodes at the Royal Marine School of Music in Deal, Kent, United Kingdom, leaving 11 people dead and 22 injured. Doe v. University of Michigan: A Michigan court rules against the hate speech law at the University of Michigan, claiming it unconstitutional. September 23 A cease-fire in the Lebanese Civil War stops the violence that had killed 900 people since March. Nintendo Company Ltd. celebrates its 100th anniversary. September 26 – Vietnam announces that it has withdrawn the last of its troops from the State of Cambodia, ending an eleven-year occupation. September 30 Nearly 7,000 East Germans who had come to Prague on special refugee trains are allowed to leave for the West. The Senegambia Confederation is dissolved over border disagreements. October October – Cold War: Perestroika – Nathan's Famous opens a hot dog stand in Moscow. October 1 – Civil union between partners in a same-sex relationship becomes legal in Denmark under a law enacted on June 7, the world's first such legislation. October 3 A coup attempt is foiled by Manuel Noriega, military leader of Panama. The government of East Germany closes the country's border with Czechoslovakia to prevent further emigration to the West. October 5 – The Dalai Lama wins the Nobel Peace Prize. October 7 The communist Hungarian Socialist Workers' Party votes to reorganise itself as a socialist party, to be named the Hungarian Socialist Party. The first mass demonstration against the Communist regime in the GDR begins in Plauen, East Germany, the beginning of a series of mass demonstrations in the whole GDR which ultimately leads to the reunification of Germany in 1990. October 9 An official news agency in the Soviet Union reports the landing of a UFO in Voronezh. In Leipzig, East Germany, protesters demand the legalisation of opposition groups and democratic reforms. October 13 Friday the 13th mini-crash: The Dow Jones Industrial Average plunges 190.58 points, or 6.91 percent, to close at 2,569.26, most likely after