The US Embassy has warned of the threat of a terrorist attack in Tsaritsyn Moscow. "The incident may cause mass casualties," the statement said. The US Embassy in Moscow issued a warning that an "event that could cause mass casualties" could occur today in Moscow. According to the embassy, an attack could take place near the Tsaritsyno museum reserve. US citizens were advised not to visit the reserve and stay away from crowded places. They were also advised to follow publications in the local media, keep their phones charged and carry documents with them. completed