moscow bomb threats force thousands people evacuate moscow bolshoi theater metropol hotel gum department store red square public place sunday local media report spate anonymous phone call cause disruption shop center train station public build across russia past two months call far prove false alarm claim responsibility ria news agency cite source police report many 5,000 people evacuate gum metropol hotel tass ria also quote police source say bolshoi theater also evacuate reuters witness say police cordoned premise bolshoi gum tass say evacuation announce bolshoi performance due start 1600 gmt alexander bortnikov head fsb security service say last month authorities know identities responsible say four russian citizens base abroad accomplices inside russia bomb threats force evacuation moscow 's bolshoi theater hotels report