The U.S. Embassy in Moscow has issued a credible threat warning about a mass casualty event at the Tsaritsyno Museum Reserve on October 31, 2026.

The U.S. Embassy in Moscow says the U.S. govt is coordinating with Russian authorities over a credible mass-casualty threat at Tsaritsyno museum and park on Oct. 31. Russia’s FSB security service says it received a U.S. warning about a terror plot in Moscow. https://meduza.io/en/news/2026/10/31/u-s-embassy-warns-of-mass-casualty-threat-at-moscow-s-tsaritsyno-museum-fsb-confirms-receiving-the-warning

"Security Alert: The U.S. Embassy in Moscow is aware of a credible threat of a mass casualty event TODAY October 31, at the Tsaritsyno Museum Reserve in Moscow. The U.S. govt is coordinating with appropriate Russian authorities on a response." https://ru.usembassy.gov/security-alert-threat-to-tsaritysyno-museum-reserve-in-moscow-october-31-2026/

US Embassy Warns of Mass Casualty Threat at Moscow Museum (Ros Krasny/Bloomberg) https://www.bloomberg.com/news/articles/2026-10-31/us-embassy-warns-of-mass-casualty-threat-at-moscow-museum http://www.memeorandum.com/261031/p47#a261031p47