The four armed men walked calmly towards the metal detectors at Crocus City Hall, firing their automatic weapons point-blank in short bursts at terrified civilians who fell screaming in a hail off bullets. Nearby, one witness named Natalya had just taken off her coat and was standing in line on Friday evening at the internal entrance to the 6,200-seat concert hall outside Moscow, where Soviet-era rock group "Picnic" was to perform its hit "Afraid of Nothing." "The shots came from behind us," Natalya, who asked for her surname not to be used, told Reuters.