The American Embassy warns of the possibility of an attack in Moscow The American Embassy in Russia has issued a warning to its citizens to stay away from the Tsaritsyno museum complex in Moscow. The reason for this warning is the existence of a "credible threat to the possibility of an event with mass casualties today". Before the ISIS attack on the concert hall of the Karchum municipality, a similar warning was issued, but with a more general content. Rank in social networks.