Two Tajikborder guards are killed and two others are injured during clashes with Kyrgyz guards, who accuse Tajikistan of taking positions at a demarcated area.
Armenia formally triggers article 4 of the Collective Security Treaty Organization (CSTO) after accusing Azerbaijan of launching an invasion. Armenian Prime MinisterNikol Pashinyan says that "we asked support from CSTO, including military support to restore Armenia's territorial integrity and ensure the withdrawal of the Azerbaijani Armed Forces from the territory of Armenia".
Russian forces launch eight cruise missiles at the dam of the Karachunivske reservoir causing extensive flooding in Kryvyi Rih and a 2.5 metres (8 ft 2 in) increase of water level in the Inhulets River.
Typhoon Muifa makes landfall in eastern China with the maximum wind speed near its centre reaching 42 metres per second (150 kilometres per hour (93 mph)).
Two Thai military personnel are killed and another is injured after a gunman opens fire at a military facility in Bangkok. The gunman is later arrested.