The U.S. Embassy in Moscow warned Americans to avoid the Tsaritsyno Museum Reserve on Saturday, October 31, after receiving information about a potential mass-casualty event. The warning names the museum reserve and surrounding area in Moscow, Russia.
The embassy alert, reproduced by Meduza, tells U.S. citizens to avoid crowds, remain aware of their surroundings, keep phones charged, carry identification and review their personal security plans. It also recommends monitoring local reporting and enrolling in the State Department's Smart Traveler Enrollment Program for updates.
Reuters reported at 4:37 p.m. UTC on October 31 that the museum had temporarily closed and access to its park was restricted, citing Russia's RIA news agency. Russia's Federal Security Service said it had received information from the United States through established channels about preparations for an attack in Moscow and was taking measures.
The embassy's warning concerns a potential threat. It does not report that an attack occurred. Its avoidance instruction specifically names October 31.
The site-specific alert sits alongside the State Department's separate Level 4 Russia travel advisory, issued December 29, 2025. That advisory tells Americans not to travel to Russia for any reason and says U.S. citizens already there should leave immediately.
The department says its ability to assist Americans in Russia is limited, especially outside Moscow. Embassy staffing is reduced, Russian authorities restrict embassy personnel's travel, and all U.S. consulates in Russia have suspended operations, including consular services.
For dual U.S.-Russian citizens, the advisory warns that Russia will not recognize their U.S. citizenship and has blocked consular officers from visiting detained dual nationals.
