Updated

The U.S. Embassy in Moscow issued a security alert warning of a credible threat of a mass-casualty event at the Tsaritsyno Museum-Reserve, a historic palace complex in Moscow. Russia's FSB confirmed it had received the warning and said it was taking appropriate action. The embassy said it was coordinating with Russian authorities over the potential incident. The Moscow Times and Ukrainska Pravda reported the alert, but no details of the nature or timing of the threat were given.