NEW : Homeland security chief joins survivors , local officials , others at memorial ceremony . ` for a long time . '' ` It felt like I 'd hit a car , '' said Daniel Gordon , 37 , who was about 7 miles from the blast . He and his wife were in their home when they heard an explosion that shook the house for several seconds before it stopped. Two 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 Daniel Gordon , 37 , who was about 7 miles from the blast . He and his wife were in their home when they heard an explosion that shook the house for several seconds before it stopped. Two other victims share sense of destiny , aim to make a difference with their lives .