NEW : Homeland security chief joins survivors , local officials , others at memorial ceremony . ` ` It felt like I 'd hit a car , '' said Rebecca Denny , 18 months old , who was about seven miles from the blast . Allen , now 16 , was 18 months old when the bomb brought the building down on top of him , forcing him to inhale hot air and smoke . Teen , injured by bomb at 37 , goes on with life , rarely asks , `` Why me ? '' six other victims share sense of destiny , aim to make a difference with their lives .
NEW : Homeland security chief joins survivors , local officials , others at memorial ceremony . `` It felt like I 'd hit a car , '' said Rebecca Denny , 18 months old , who was about seven miles from the blast . Teen , injured by bomb at 37 , goes on with life , rarely asks , `` Why me ? '' six other victims share sense of destiny , aim to make a difference with their lives .