By Dan Kelley PHILADELPHIA (Reuters) - Borbor Davis' family dialed his cell phone every hour, hoping its ring would be heard by rescuers searching through the rubble of a building that collapsed on his workplace in Philadelphia. But the cell phone went unanswered as darkness fell on Wednesday. Authorities later said Davis' body had been found buried under the debris. Davis, 68, was among six people killed when a building under demolition collapsed on a neighboring Salvation Army Thrift Store at 10:45 a.m. on Wednesday. Fourteen people were injured in the incident, one critically. ...

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