store. >> i heard a great big crack. >> claude davis across the street watching from his apartment. >> i looked and seen the building crumble. oh, it was painful. oh, my goodness, and i thought about all of the people in there that couldn't get out of there and i screamed and hollered. >> reporter: those people who couldn't get out include those who died and at least a dozen customers. jordan mclaughlan ran in to help. >> people inside the building, you heard them screaming. >> another rescuers, standing on the rubble. helped pull four people out. >> we were on top of the roof, pulling them out. when we got there, all you could hear is help and maybe see a hand or something through the rubble. >> reporter: philadelphia mayor michael nutter says they don't know how many people in the thrift store at the time. to prevent any further collapse,