Russia: US warns of mass-casualty attack risk in Moscow and urges people to avoid a museum

On October 31, 2026, the US Embassy in Moscow reported a credible mass-casualty threat targeting the Tsaritsyno Museum Reserve in the south of the capital. The FSB told TASS it had received US information about preparations for a terrorist attack and was taking appropriate measures. The warning recalled a March 8, 2024 alert, followed two weeks later by the Crocus City Hall attack, which killed 145 people and was claimed by the Islamic State. In 2019, US intelligence had also helped thwart a planned attack in Saint Petersburg, prompting Vladimir Putin to thank Donald Trump.