PHILADEPHIA, PENN. - Federal, state, and city officials are investigating the building collapse in Philadelphia that killed at least six people, and injured 14 others.
Construction crews were demolishing a vacant four-store building Wednesday when it suddenly came down on top of a Salvation Army Thrift Store.
Roofers who were working nearby say the demolition crew didn't seem to know what it was doing. Window-washers say a 30-foot wall had not been braced.
Thursday, crews took down a wall that was left standing to make the search area safer for first responders.
Wednesday night, a 61-year-old woman was found about 13 hours after she was buried alive. She was taken to the hospital in critical condition.
The city says the demolition company had proper working permits and no violations have been filed against it.