of Henck Arron; leaders Dési Bouterse and Roy Horb replace it with a National Military Council. February 27 – M-19 guerrillas begin the Dominican embassy siege in Colombia, holding 60 people hostage, including 14 ambassadors. March March 1 The Commonwealth Trade Union Council is established. The Voyager 1 probe confirms the existence of Janus, a moon of Saturn. March 3 - Pierre Trudeau returns to office as Prime Minister of Canada. March 4 – Robert Mugabe is elected Prime Minister of Zimbabwe. March 8 – The Soviet Union's first rock music festival starts. March 14 – LOT Polish Airlines Flight 007 crashes during an emergency landing near Warsaw, Poland, killing a 14-man American boxing team and 73 others. March 18 – Fifty people are killed at the Plesetsk Cosmodrome in Russia, when a Vostok-2M rocket explodes on its launch pad during a fueling operation. March 19 – 20 – The , the ship housing pirate radio station Radio Caroline, sinks off the English coast (the station returns aboard a new ship in 1983). March 21 – U.S. President Jimmy Carter announces that the United States will boycott the 1980 Summer Olympics in Moscow because of the Soviet invasion of Afghanistan. March 26 – A mine lift cage at the Vaal Reefs gold mine in South Africa falls , killing 23 workers. March 27 – The Norwegian oil platform Alexander L. Kielland collapses in the North Sea, killing 123 of its crew of 212. March 28 – The Talpiot Tomb is discovered by construction workers in Jerusalem. April April 1 – The Southern African Development Coordination Conference (SADCC) is formed in Lusaka, Zambia. April 2 – The St Pauls riot breaks out in Bristol. April 7 – The United States severs diplomatic relations with Iran and imposes economic sanctions, following the taking of American hostages on November 4, 1979. April 10 – In Lisbon, Portugal, the governments of Spain and the United Kingdom agree to reopen the border between Gibraltar and Spain in 1985, closed since 1969. April 12 1980 Liberian coup d'état: Samuel K. Doe overthrows the government of Liberia in a violent coup d'état, assassinating President William Tolbert and 26 other people and ending over 130 years of democratic presidential succession in that country. Terry Fox begins his Marathon of Hope, a plan to run across Canada to raise money for cancer research, setting off from St. Johns, Newfoundland