Search teams in Philadelphia pull a survivor from the wreckage of a building collapse after more than 12 hours.<br/> <br />The 61-year-old woman was said to be in a critical condition.<br/> <br />At least six people were killed when a building under demolition collapsed onto a neighbouring Salvation Army thrift store.<br/> <br />At least 14 people have been injured.<br/> <br />It's still unclear how many people were inside the thrift store when the accident happened.<br/> <br />Authorities say the cause of the collapse is still under investigation.
