rocked by a gas related explosion. three construction workers are being treated this morning. we have more live from the scene of the explosion in marble hill. reporter: well, chris, the damage is just on the other side of the building behind me. the three construction worker, two of them in serious condition and another one critical at the hospital. meanwhile, investigators trying to pin point the cause of that blast. the blown out facade and mangled debris at jfk high school inspected by fire investigators overnight. a lot of work being done right now to decide what we re going to do going further to stabilize the building. reporter: a powerful blast that left the neighborhood shaken. we thought it was a terrorist attack. reporter: happening just after 8:00 thursday night was so loud, the blast from jfk high school jolted people nearby not knowing what was going on. oh my god, we we want outside and my neighbors were like, do you feel that? what was that? and
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