The U.S. Embassy in Moscow issued an urgent security alert on Saturday, October 31, 2026, saying it was "aware of a credible threat of a mass casualty event TODAY" at the Tsaritsyno Museum Reserve, a palace and park complex at Dolskaya Ulitsa 1 in southern Moscow. It urged people to avoid the area, stay alert, avoid crowds, keep phones charged and review personal security plans. The embassy said it was coordinating with Russian authorities. It did not give details of the suspected plot, possible targets or who might be behind it.
Russian state media reported that the Federal Security Service (FSB) had received information from U.S. partners about plans for a terrorist attack in Moscow, and said it was taking appropriate measures. The alert was issued amid heightened security concerns in Moscow on Halloween and as Russia and Ukraine's war escalated, with Ukraine striking a refinery in southern Russia the day before.
Coverage has compared the warning to the U.S. alert issued before the March 2024 Crocus City Hall attack, which killed more than 140 people. No public evidence links the two cases, and reporting so far does not say whether an attack was prevented or whether anything happened at the site. The Moscow Times reported the alert in its October 31 coverage, and Fox News, LBC and the Human Events report carry the same embassy text.
🕒 As of October 2026
