ends in the United States, and Major League Baseball resumes with the All-Star Game in Cleveland's Municipal Stadium. August 12 – The original Model 5150 IBM PC (with a 4.77 MHz Intel 8088 processor) is released in the United States at a base price of $1,565. August 19 – Gulf of Sidra incident: Libyan president Muammar Gaddafi sends two Sukhoi Su-22 fighter jets to intercept two U.S. Navy fighters over the Gulf of Sidra. The U.S. jets destroy the Libyan fighters. August 23 – South African troops attack SWAPO bases in Xangongo and Ongiva, Angola, during Operation Protea. August 24 – Mark David Chapman is sentenced to 20 years to life in prison after pleading guilty to murdering John Lennon in Manhattan eight months earlier. August 27 – North Korea fires a surface-to-air missile at a U.S. SR-71 Blackbird spy plane flying in South Korean and international airspace. The missile misses and the airplane is unharmed. August 30 – 1981 Iranian Prime Minister's office bombing: Eight people, including the country's president and prime minister, are killed when a briefcase, planted by People's Mujahedin of Iran, explodes in the building. August 31 – A bomb explodes at the United States Ramstein Air Base in West Germany, injuring 20 people. September September – Little Miss Bossy, the first book in the Little Miss series (of the female versions of Mr. Men) is first published. September 1 – Gregorio Conrado Álvarez is inaugurated as a military de facto President of Uruguay. September 4 – An explosion at a mine in Záluží, Czechoslovakia, kills 65 people. September 7 – British plantation company, Guthrie was taken over by the Malaysian government after successfully purchasing shares to become the major shareholder. This is famously called the 'Dawn Raid attack'. September 10 – Picasso's painting Guernica is moved from New York to Madrid. September 15 Our Lady of Akita in Japan cries for the last time, on the Feast of Our Lady of Sorrows. The John Bull becomes the oldest operable steam locomotive in the world, at 150 years old, when it operates under its own power outside Washington, D.C. September 17 – Ric Flair defeats Dusty Rhodes to win his first World Heavyweight Wrestling Championship in Kansas City. September 18 – France's National Assembly votes to abolish Capital punishment in France. September 19 – Solidarity Day march, in support of organized labor, draws approximately 250,000 people