1190 – Massacre of Jews at Clifford's Tower, York.
1244 – Over 200 Cathars who refuse to recant burn to death after the Fall of Montségur.
1945 – Ninety percent of Würzburg, Germany is destroyed in only 20 minutes by British bombers, resulting in at least 4,000 deaths.
1962 – Flying Tiger Line Flight 739 disappears in the western Pacific Ocean with all 107 aboard missing and presumed dead.
1968 – Vietnam War: My Lai Massacre occurs; between 347 and 500 Vietnamese villagers are killed by American troops.
1969 – A Viasa McDonnell Douglas DC-9 crashes in Maracaibo, Venezuela, killing 155.
1978 – A Balkan Bulgarian Airlines Tupolev Tu-134 crashes near Gabare, Bulgaria, killing 73.
1978 – Supertanker Amoco Cadiz splits in two after running aground on the Portsall Rocks, three miles off the coast of Brittany, resulting in the largest oil spill in history at that time.
1988 – Halabja chemical attack: The Kurdish town of Halabja in Iraq is attacked with a mix of poison gas and nerve agents on the orders of Saddam Hussein, killing 5,000 people and injuring about 10,000 people.
1988 – The Troubles: Ulster loyalist militant Michael Stone attacks a Provisional IRA funeral in Belfast with pistols and grenades. Three persons, one of them a member of PIRA are killed, and more than 60 others are wounded.
2001 – A series of bomb blasts in the city of Shijiazhuang, China kill 108 people and injure 38 others, the biggest mass murder in China in decades.
2014 – Crimea votes in a controversial referendum to secede from Ukraine to join Russia.
2016 – A bomb detonates in a bus carrying government employees in Peshawar, Pakistan, killing 15 and injuring at least 30.
2016 – Two suicide bombers detonate their explosives at a mosque during morning prayer on the outskirts of Maiduguri, Nigeria, killing 24 and injuring 18.
2021 – Atlanta spa shootings: Eight people are killed and one is injured in a trio of shootings at spas in and near Atlanta, Georgia, U.S.
2022 – A 7.3-magnitude earthquake strikes off the coast of Fukushima, Japan, killing at least four people and injuring more than 225 others.