US warns of credible mass-casualty threat at Moscow's Tsaritsyno Museum Reserve

Russia has responded after the US embassy in Moscow warned of a credible threat of a mass-casualty event at the Tsaritsyno Museum Reserve in the capital. Russian security services said they had received information from the United States about a planned terrorist attack and were carrying out appropriate measures. The warning prompted advice to avoid the area, stay alert and stay away from crowds.

The US embassy said it was aware of a credible threat on Saturday local time at the Tsaritsyno Museum Reserve, an imperial palace and park complex in southern Moscow that is popular with weekend visitors. It said it had coordinated with the relevant Russian authorities on a response. The embassy did not identify who was behind the alleged plot, and no further details were given publicly about the nature of the threat.

Russian authorities said the FSB had received information from the United States regarding the preparation of a terrorist attack. Russian news agencies quoted the security service as saying that appropriate work was under way. A Russian Telegram channel with reported law-enforcement links said the park had been closed and was open only for exits.

The reported closure suggests the warning led to immediate restrictions at one of Moscow's better-known public sites. The alert comes against the backdrop of heightened concern over mass-casualty attacks in Russia's capital. In March 2024, the US embassy warned that extremists had imminent plans for an attack in Moscow, days before gunmen attacked Crocus City Hall outside the city and killed more than 140 people.

That earlier attack remains one of the deadliest in Russia in recent years and continues to shape the response to security warnings in the capital. The latest exchange also highlights the unusual level of direct security coordination between Washington and Moscow despite broader tensions over Russia's war in Ukraine. The Tsaritsyno Museum Reserve is both a cultural landmark and a public gathering place, which makes any threat there significant for local security planning.

The warning also shows how quickly intelligence alerts can lead to visible restrictions in a major city when officials judge the risk to be credible. What remains unclear is who was allegedly preparing the attack, whether any arrests have been made, and how long restrictions at the museum reserve will remain in place. It is also not known whether the threat was specific to a particular time or method.

The key issue to watch is whether Russian authorities provide further detail or confirm that the danger has been contained.

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