crew in the area that hit a natural gas line. then at 10:07, as evacuations were underway, that massive blast. >> the whole building shook. it was, like, intense. i felt it through my whole body. >> reporter: watch as this nearby bridge cam captured the impact and sound of the blast. the explosion killing at least one person, 17 others rushed to the hospital, six in critical condition tonight. >> oh, my god. >> reporter: the destruction seen from every angle. this is our first up-close look at some of the destruction. and everywhere you look, there are bricks and glass everywhere. you can see how powerful the blast was. five buildings were effected. across the street, all the windows blown out. in the building just next door, you can see the windows are gone, as well, and the roof has caved in. >> all you see is a cloud of smoke go up, and then you see the building just slowly crumble down. >> reporter: students at a nearby school were forced to evacuate. several businesses damaged or destroyed, including one housing a world class vintage porsche collection.