The U.S. Embassy in Moscow warned Americans to avoid going to concerts in Moscow just weeks before gunmen launched an attack at a concert venue on Friday. Several gunmen opened fire at Crocus City Hall‚ a large music venue in the Moscow area‚ leaving an unknown number of victims injured. Many details about the shooting‚ including who the suspected shooters are and what their motive may have been‚ remained unclear as responders were still at the scene. Just weeks prior on March 7‚ the...