This is the cbs evening news good evening, everyone, im jeff glor with a western edition of the broadcast. The olimics in sochi russia are six weeks way which is why tonight there is so much attention focused on a horrific attack inson portion of the country today. A suicide bomber killed at least 16 after setting off a bomb inside a central train station. With more on what happened and what we know heres Holly Williams. Reporter a Security Camera captured the explosion that tore through volume go grad train statio station volume go grade strain station. When the bomber detonated the 20 pound device the station was packed with people. Victims were killed by flying shrapnel in a massive blast that blew out the buildings doors. This woman had a narrow escape when she left the station just moments before the bomb went off. I saw people running, she said. Human flesh all around. Shattered glass and broken doors. I saw smoke but i didnt understand what was going on. No one group has claimed