US embassy warns citizens of Moscow attack threat; Russia's FSB says it received US intelligence

The U.S. embassy in Moscow warned citizens of a credible mass-casualty threat, and Russia's FSB says it received U.S. intelligence of a planned terrorist attack.

• The U.S. embassy in Moscow urged American citizens to avoid public places, squares, and crowded gatherings.
• The embassy said it is aware of a credible threat of an incident causing mass casualties at the Tsaritsyno museum in Moscow.
• Russia's FSB said it received intelligence from Washington via official partner channels about preparations for a terrorist attack in Moscow.
• The FSB said it has begun intensive security and operational measures across Moscow to thwart the plan.