I freaked out -- shook my living room window and I live about five miles away -- it was loud.
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IF this was a HOMICIDE BOMB that exploded prematurely, then for maximum collateral damage there should be projectiles to form the basis for killing shrapnel. This guy was an engineering student, so he would have known about that. No shrapnel damage or marks on anything: trees, sidewalk, buildings, some of it should have traveled quite a ways to shatter a window further away...