September 21, 2023 (Thursday)
Armed conflicts and attacks
- Aftermath of the 2023 Azerbaijani offensive in Nagorno-Karabakh
- Delegates from Azerbaijan and Artsakh meet in the Azeri city of Yevlakh. No formal agreement is adopted after two hours of talks. (Daily Sabah)
- Russian invasion of Ukraine
Business and economy
- Rupert Murdoch announces his retirement as the chairman of Fox Corporation and News Corp. (NBC News)
Disasters and accidents
- Four people are killed and five others are injured in an explosion at a gas pipeline in Vrancea County, Romania. (Reuters)
- Two people are killed and more than 40 others are injured when a bus rolls over in Wawayanda, New York, United States. (NBC News)
International relations
- Canada–India relations
- Death of Hardeep Singh Nijjar
- Amid a diplomatic crisis, India suspends the issuance of travel visas to Canadian citizens due to alleged security threats at its High Commission and consulates in Canada. (BBC News)
- Death of Hardeep Singh Nijjar
Science and technology
- NASA confirms that the James Webb Space Telescope has identified carbon dioxide on the Jovian moon Europa. The carbon dioxide, detected in a specific region on the moon's icy surface is believed to have originated from within its subsurface ocean. (NASA)