US Embassy warns of Tsaritsyno mass-casualty threat

The U.S. Embassy in Moscow on October 31, 2026, warned of a credible threat of a mass casualty event that day at the Tsaritsyno Museum Reserve at Dolskaya Ulitsa 1. It said it had received information about a real threat of an attack that could cause numerous casualties and that the U.S. government was coordinating response measures with relevant Russian authorities. The embassy advised avoiding the site and crowds, staying alert, keeping cellphones charged, carrying identification, and monitoring local media. The FSB said it received the information through partner channels and that relevant measures are being undertaken. The museum covers more than 405 hectares with Neo-Gothic palaces, forests, bridges and ponds, was founded in 1775 as a summer home for Catherine II, and attracts more than two million visitors a year per a 2023 citation of deputy mayor Natalya Sergunina. teleSUR reported a concert scheduled that evening and a similar 2024 embassy warning two weeks before the Crocus City Hall attack that killed 151 people. NEXTA reported possible evacuation and cordoning, unconfirmed. teleSUR cited Baza via Faytuks on closure for at least two days, K-9 units, and restricted access. No factual dispute found in the record. The alert describes a potential threat, not an attack that occurred. Whether reported on-site measures took place remained unresolved.