to the Iran–Contra affair. His conviction is vacated on appeal in 1991. May 9 – Andrew Peacock deposes John Howard as Federal Opposition Leader of Australia. May 10 – The government of President of Panama Manuel Noriega declares void the result of the May 7 presidential election, which Noriega had lost to Guillermo Endara. May 11 President Bush orders 1,900 U.S. troops to Panama to protect Americans there. The ACT (Australian Capital Territory) Legislative Assembly meets for the first time. May 12–25 – San Bernardino train disaster: Southern Pacific freight locomotive SP 7551 East derails in a residential area of San Bernardino, California, killing four and destroying seven houses. On May 25, as a direct result of the derailment, the Calnev Pipeline explodes, killing an additional two people and destroying eleven more houses and 21 cars. May 14 Mikhail Gorbachev visits China, the first Soviet leader to do so since Nikita Khrushchev in the 1960s, ending the Sino-Soviet split. Carlos Menem wins the Argentine presidential election. May 15 Australia's first private tertiary institution, Bond University, opens on the Gold Coast. The last golden toad is seen in Costa Rica; the species is subsequently classified as extinct. May 17 1989 Tiananmen Square protests: More than 1,000,000 Chinese protesters march through Beijing demanding greater democracy, leading to a crackdown. In Stuttgart Napoli of Diego Maradona wins the Uefa Cup. May 19 1989 Ürümqi unrest: Uyghur and Hui Muslim protesters riot in front of the government building in Ürümqi, China. 1989 Tiananmen Square protests: Zhao Ziyang meets the demonstrators in Tiananmen Square. Ciriaco De Mita resigns as Prime Minister of Italy. May 20 – 1989 Tiananmen Square protests: The Chinese government declares martial law in Beijing. May 24 Milan of Italy wins the European Cup beating Steaua București of Romania 4–0 in Barcelona. Assassinations of Jeffrey Brent Ball and Todd Ray Wilson: A terrorist organization, Zarate Willka Armed Forces of Liberation, kills two American missionaries of the Church of Jesus Christ of Latter-day Saints as they return to their apartment, in La Paz, Bolivia. May 25 – The Calgary Flames defeat the Montreal Canadiens four games to two to win the franchise's first Stanley Cup in ice hockey. May 29 Amid food riots and looting set off by inflation, the Government of Argentina declares a nationwide state of siege. 1989 Tiananmen Square protests: The high Goddess of Democracy statue is unveiled in Tiananmen