31 – Süleyman Demirel of AP forms the new government of Turkey (39th government), a four-party coalition, so-called First National Front ()). April April 4 Vietnam War: The first military Operation Babylift flight, C5A 80218, crashes 27 minutes after takeoff, killing 138 on board; 176 survive the crash. Bill Gates and Paul Allen found Microsoft in Albuquerque, New Mexico. April 5 – The Soviet manned space mission (Soyuz 18a) ends in failure during its ascent into orbit when a critical malfunction occurs in the second and third stages of the booster rocket during staging at an altitude of 192 km, resulting in the cosmonauts and their Soyuz spacecraft having to be ripped free from the vehicle. Both cosmonauts (Vasily Lazarev and Oleg Makarov) survive. April 9 Asia's first professional basketball league, the Philippine Basketball Association, plays its first game at the Araneta Coliseum. Eight people in South Korea, who are involved in the People's Revolutionary Party Incident, are hanged. April 13 Bus massacre: The Kataeb militia kills 27 Palestinians during an attack on their bus in Ain El Remmeneh, Lebanon, triggering the Lebanese Civil War which lasts until 1990. A coup d'état in Chad led by the military overthrows and kills President François Tombalbaye. April 17 – The Khmer Republic surrenders, when the Communist Khmer Rouge guerilla forces capture Phnom Penh ending the Cambodian Civil War, with mass evacuation of American troops and Cambodian civilians. April 18 – The Khmer Rouge begins a forcible mass evacuation of the city and starts the genocide. April 19 – Nico Diederichs becomes the 3rd State President of South Africa. April 20 – Taman Mini Indonesia Indah opens to the public in Jakarta, Indonesia. April 24 – Six Red Army Faction terrorists take over the West German embassy in Stockholm, take 11 hostages and demand the release of the group's jailed members; shortly after, they are captured by Swedish police (See West German Embassy siege). April 25 – Vietnam War: As North Vietnamese Army forces close in on the South Vietnamese capital Saigon, the Australian Embassy is closed and evacuated, almost 10 years to the day since the first Australian troop commitment to South Vietnam. April 29 – Vietnam War: North Vietnam concludes its East Sea Campaign by capturing all of the Spratly Islands that were being held by South Vietnam. April 30 – The Vietnam War ends with the Fall of Saigon: The