[Apocalyptic Calendar] April-June / July-September / October-December
1920 – Palm Sunday tornado outbreak of 1920 affects the Great Lakes region and Deep South states. The tornadoes left at least 153 dead and at least 1,215 injured.
1933 – The Imperial Airways biplane City of Liverpool is believed to be the first airliner lost to sabotage when a passenger sets a fire on board.
1939 – Spanish Civil War: Generalissimo Francisco Franco conquers Madrid after a three-year siege.
1965 – An Mw 7.4 earthquake in Chile sets off a series of tailings dam failures, burying the town of El Cobre and killing at least 500 people.
1968 – Brazilian high school student Edson Luís de Lima Souto is killed by military police at a student protest.
1970 – An earthquake strikes western Turkey at about 23:05 local time, killing 1,086 and injuring at least 1,200.
1979 – A coolant leak at the Three Mile Island's Unit 2 nuclear reactor outside Harrisburg, Pennsylvania leads to the core overheating and a partial meltdown.
1994 – In South Africa, African National Congress security guards kill dozens of Inkatha Freedom Party protesters.
1999 – Kosovo War: Serb paramilitary and military forces kill at least 130 Kosovo Albanians in Izbica.
2005 – An earthquake shakes northern Sumatra with a magnitude of 8.6 and killing over 1000 people.
2022 – Invasion of Ukraine: The war in the Ukraine is ongoing for 764 days.
2023 – The war between Israel and Hamas in the Gaza is ongoing for 173 days.