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World · October 31, 2026

U.S. warned Russia of possible Moscow terror attack, FSB says

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On October 31, 2026, the U.S. Embassy in Moscow issued an urgent security alert regarding a 'credible threat' of a 'mass casualty event' at the Tsaritsyno Museum Reserve. The embassy stated that it is coordinating with Russian authorities to respond to the threat at the popular 1,000-acre imperial palace and park complex. Russia’s Federal Security Service (FSB) confirmed receipt of the intelligence from U.S. partner channels and reported that 'appropriate measures' or 'work' are underway. Local reports indicated that the park was closed to new visitors and law enforcement was present on the grounds.

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Reported across the spectrum

  • The U.S. Embassy in Moscow issued a security alert for October 31 regarding a credible threat at the Tsaritsyno Museum Reserve.
  • The U.S. government is coordinating with Russian authorities on a response to the threat.
  • Russia's Federal Security Service (FSB) received the intelligence from U.S. partners.
  • The Tsaritsyno Museum Reserve was founded in 1775 as a summer home for Catherine II and is a popular tourist attraction.
  • The FSB stated it is taking 'appropriate' measures or actions in response to the information.

Reported by only some outlets

  • The Tsaritsyno Palace Museum and Reserve was evacuated according to Russian media.
  • The Tsaritsyno grounds attracted more than 2 million visitors in 2022.
  • Russian Telegram channel Baza reported the park was closed and 'open only for exits' with law enforcement on-site.
  • The U.S. Embassy's warning included instructions to avoid the area, stay alert, and keep cellphones charged.

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