The United States has warned of a credible threat of a mass-casualty event at one of Moscow’s best-known historic sites, prompting Russian authorities to close the complex and step up security on Saturday.
The US Embassy in Moscow said it was aware of a credible threat of a mass-casualty event on Saturday, 31 October, at the Tsaritsyno Museum Reserve, at Dolskaya Ulitsa 1 in the south of the Russian capital. It urged Americans to avoid the site and the surrounding area for the day, to stay alert, avoid crowds, keep their phones charged and carry identification, and said the US government was coordinating with Russian authorities on a response.
Russia’s Federal Security Service (FSB) said separately that it had received information from the United States through established partner channels about preparations for a terrorist attack in Moscow and was taking appropriate measures. The FSB statement, reported by Reuters, did not name Tsaritsyno or describe the nature of the information, so the two statements have not been explicitly linked in public by either side.
The Tsaritsyno Museum Reserve, a palace museum and park complex south of Moscow, was temporarily closed and access to the park restricted, the RIA news agency reported, citing Russian law enforcement agencies. The sprawling palace grounds, founded in 1775 as Empress Catherine II’s summer residence, cover roughly 1,000 acres and attract millions of visitors a year.
The embassy alert gave no further detail: it did not name any suspects, describe a method, or say where its information came from. As of Saturday evening, no incident or casualties at the site had been reported.
The warning carries an uncomfortable precedent. In March 2024, the US Embassy warned that extremists had imminent plans for an attack in Moscow; days later, gunmen stormed the Crocus City Hall concert venue, killing more than 140 people. The United States currently lists Russia at Level 4, “Do Not Travel”, citing terrorism among other risks.
For now, the picture is one of warning rather than attack: a specific site named by Washington, a general confirmation from Moscow’s security service, and a closed palace park. What remains unclear is whether the threat has been neutralised, or whether the closure is precautionary while checks continue.
Sources: U.S. Embassy in Moscow, “Security Alert: Threat to Tsaritysyno Museum Reserve in Moscow (October 31, 2026)”, https://ru.usembassy.gov/security-alert-threat-to-tsaritysyno-museum-reserve-in-moscow-october-31-2026/ ; Reuters, “FSB says US warned Russia of possible Moscow attack” (31 October 2026), https://www.reuters.com/world/fsb-says-us-warned-russia-possible-moscow-attack-2026-10-31/
