In response to a credible warning from the U.S. Embassy, Russian authorities have detained a teenager suspected of planning a terrorist attack in Moscow. The Federal Security Service (FSB) confirmed that the tip-off led to the arrest, specifically regarding a potential mass-casualty event at the Tsaritsyno museum. The U.S. had previously alerted Russia about the threat, describing it as a serious concern and prompting immediate security measures, including the evacuation of the museum. Both the U.S. and Canadian governments have echoed warnings regarding a possible attack in Moscow, emphasizing the need for heightened vigilance.