Russia’s Federal Security Service said it was responding to U.S. information about preparations for an attack in Moscow, while a separate U.S. Embassy alert named a cultural site as a potential target.
The FSB said the information came through established cooperation channels. Its public statement did not identify a specific location.
The embassy’s alert named the Tsaritsyno Museum Reserve for Oct. 31 and warned of a “credible threat of a mass casualty event.” It said U.S. officials were coordinating with Russian authorities and advised people to avoid the reserve, nearby areas and crowds.
Neither public statement linked the FSB’s account to Tsaritsyno. The statements did not identify a suspect, group or method.
The site’s operating status was disputed in separate media reports. TASS, citing emergency response services, said the grounds had been temporarily closed. Meduza reported that a museum representative told the Telegram channel Mash that the site was operating normally and staff had not been informed of a threat.
At least 140 people died in the March 22, 2024, attack on Crocus City Hall, according to a Lead Inspector General report to Congress on Operation Enduring Sentinel. The report says the U.S. Embassy in Moscow issued an alert on March 7 about threats to large gatherings before the attack, and that U.S. officials shared intelligence with Russian security services. It describes the disclosures as part of a policy intended to protect civilians.
