The Russian Federal Security Service (FSB) announced that the US had provided information about the preparation of a terrorist attack in Moscow through official communication channels between the two countries. On Saturday, October 31, the state-run news agency Ryanovasti reported, citing the FSB, that this institution had begun the necessary steps to deal with the possible threat after receiving information from the United States. At the same time, the US Embassy in Moscow announced that it is aware of a "credible threat of an event with mass casualties" on Saturday at the Tsaritsyno museum complex and Hamshomer Park. The American embassy also announced that the government of this country is coordinating with the Russian authorities regarding this threat.

The Russian Federal Security Service (FSB) announced that the US had provided information about the preparation of a terrorist attack in Moscow through official communication channels between the two countries. On Saturday, October 31, the state-run news agency Ryanovasti reported, citing the FSB, that this institution had begun the necessary steps to deal with the possible threat after receiving information from the United States. At the same time, the US Embassy in Moscow announced that it is aware of a "credible threat of an event with mass casualties" on Saturday at the Tsaritsyno museum complex and Hamshomer Park. The American embassy also announced that the government of this country is coordinating with the Russian authorities regarding this threat.