President Truman relieves Douglas MacArthur of the command of American forces in Korea and Japan. 1951 – The Stone of Scone, the stone upon which Scottish monarchs were traditionally crowned, is found on the site of the altar of Arbroath Abbey. It had been taken by Scottish nationalist students from its place in Westminster Abbey. 1952 – Bolivian National Revolution: Rebels take over Palacio Quemado. 1955 – The Air India Kashmir Princess is bombed and crashes in a failed assassination attempt on Zhou Enlai by the Kuomintang. 1957 – United Kingdom agrees to Singaporean self-rule. 1961 – The trial of Adolf Eichmann begins in Jerusalem. 1963 – Pope John XXIII issues Pacem in terris, the first encyclical addressed to all Christians instead of only Catholics, and which described the conditions for world peace in human terms. 1964 – Brazilian Marshal Humberto de Alencar Castelo Branco is elected president by the National Congress. 1965 – The Palm Sunday tornado outbreak of 1965: Fifty-one tornadoes hit in six Midwestern states, killing 256 people. 1968 – President Lyndon B. Johnson signs the Civil Rights Act of 1968, prohibiting discrimination in the sale, rental, and financing of housing. 1968 – Assassination attempt on Rudi Dutschke, leader of the German student movement. 1970 – Apollo Program: Apollo 13 is launched. 1976 – The Apple I is created. 1977 – London Transport's Silver Jubilee AEC Routemaster buses are launched. 1979 – Ugandan dictator Idi Amin is deposed. 1981 – A massive riot in Brixton, south London results in almost 300 police injuries and 65 serious civilian injuries. 1986 – FBI Miami Shootout: A gun battle in broad daylight in Dade County, Florida between two bank/armored car robbers and pursuing FBI agents. During the firefight, FBI agents Jerry L. Dove and Benjamin P. Grogan were killed, while five other agents were wounded. As a result, the popular .40 S&W cartridge was developed. 1987 – The London Agreement is secretly signed between Israeli Foreign Affairs Minister Shimon Peres and King Hussein of Jordan. 1990 – Customs officers in Middlesbrough, England, seize what they believe to be the barrel of a massive gun on a ship bound for Iraq. 1993 – Four hundred fifty prisoners rioted at the Southern Ohio Correctional Facility in Lucasville, Ohio, and continued to do so for ten days, citing grievances related to prison conditions, as well as the forced vaccination of Nation of Islam