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The windows to get out. we're going to be exploring more about how the passengers got out and if there were proper evacuation methods put into place, and we will examine that later in the show. this happened along the busiest passenger rail line in the country, and the northeast corridor spans from washington, d.c. to boston. let's bring in alicia at new york's penn station. that was supposed to be the final destination of the train. good morning. >> reporter: that's right. it's the busiest train hub in north america. this is a vital intersection for many passengers and there has been disrupti...

His investigation wraps up. >> reporter: this explosion happened about three hours ago about midday, moscow time. there could be a number of causes. we are hearing that it was a female suicide bomber. some 400 mile as way in the troubled region. and we know for example that on saturday, a suspected islamist militant was there. but at the same time it is possible that this is simply a wider call to try and spread terror ahead of the olympics which are coming. it is a train hub where you would have to take the train up to moscow. we know that the black widows