Chennai: It was chaos all around at the Chennai Central Railway Station as passengers ran out of the Guwahati-Bangalore Express in panic soon after the two bombs went off in the coaches of the train. A passenger, who was travelling by the S3 coach, narrating his experience, said, "I was awake and resting on my berth. At about 7.15 AM, we heard some sound from the next coach. I came out of the coach and saw what had happened in S4 and S5 coaches". Most passengers, who were panic-stricken, also rushed out, he said. "We saw three to four injured persons writhing in pain." "Initially we thought it was the sound of a cylinder explosion. But we later learnt that it was bomb explosion", the passenger said. One passenger was killed and eleven others injured in two bomb blasts that went off in quick succession on the train bound for Guwahati.