Protests in Azerbaijan, part of the Dissolution of the Soviet Union.
Malta votes on the introduction of divorce; the proposal was approved by 53% of voters, resulting in a law allowing divorce under certain conditions being enacted later in the year.
The Six-Day War in Kisangani begins in Kisangani, in the Democratic Republic of the Congo, between Ugandan and Rwandan forces. A large part of the city is destroyed.
The Holocaust in Ukraine: At Chortkiv, the Ukrainian police and German Schutzpolizei deport two thousand Jews to Bełżec extermination camp. Five hundred of the sick and children are murdered on the spot. This continued until the next day.
French physicist Augustin-Jean Fresnel, in a "note" read to the Academy of Sciences, reports a direct refraction experiment verifying David Brewster's hypothesis that photoelasticity (as it is now known) is stress-induced birefringence.
The 9.1–9.3 Mw Indian Ocean earthquake shakes northern Sumatra with a maximum Mercalli intensity of IX (Violent). One of the largest observed tsunamis, it affected coastal and partially mainland areas of Thailand, India, Sri Lanka, the Maldives, Malaysia, Myanmar, Bangladesh, and Indonesia; death toll is estimated at 227,898.
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