A four-story building being demolished collapsed Wednesday on the edge of downtown, injuring... (Associated Press) 
 
 Emergency personnel respond to a building collapse in downtown Philadelphia, where the city fire commissioner says as many as eight to 10 people are believed trapped in the rubble, Wednesday, June 5,... (Associated Press) 
 
 Emergency personnel respond to a building collapse in downtown Philadelphia, where the city fire commissioner says as many as eight to 10 people are believed trapped in the rubble, Wednesday, June 5,... (Associated Press) 
 
 Rescue personnel search the scene of a building collapse in downtown Philadelphia Wednesday June 5, 2013. Borbor Davis, 68, of Upper Darby, was last seen working inside the store's basement, the Inquirer reported. Philadelphia Mayor Nutter this morning pledged a "wide-ranging" investigation into the collapse that left five women and one man dead, and injured more than a dozen others. Nutter lauded the efforts of several citizen heroes who rushed into the cloud of dust and debris moments after the collapse to help pull people from the disaster.  A building that was being torn down collapsed with a thunderous boom Wednesday, raining bricks on a neighboring thrift store, killing a woman and injuring at least 13 other people in an accident that witnesses said was bound to happen. Carlton Williams of the city's Department of Licenses and Inspections said there were no existing violations on the building, and the demolition company had proper permits for the work. A four-story building being demolished collapsed Wednesday on the edge of downtown, injuring... (Associated Press) 
 
 The woman who died was 35 years old, the mayor said, but no other information about her was released. The museum said on Facebook that it would be closed until further notice. Rescuers pulled another woman, trapped amid the rubble of a Salvation Army thrift store, after they heard her voice, city fire Commissioner Lloyd Ayers said, and the search for survivors continued hours after the 10:45 a.m. collapse on the edge of downtown. The building collapsed onto the Salvation Army Thrift Store next door with an ominous rumble, witnesses said. "I was standing there looking out my window, watching the men at work on the building, and the next thing I know I heard something go kaboom," Veronica Haynes said.  Story highlights A woman is pulled out alive 
 
 An active search and rescue operation continues on site 
 
 Of the 13 treated at hospitals after the incident, five are released 
 
 The building was being demolished when it collapsed, authorities say 
 
 A vacant building being demolished collapsed onto a thrift store in Philadelphia early Wednesday, killing six people and trapping more than a dozen under rubble, officials said. Brian Mullins, 23, was unloading paint at the nearby Mutter Museum when he heard the building fall. He and his coworkers ran toward the building, and pulled six people from the rubble, he said. He said he tried to keep the people inside the building calm amid chaos in the moments after the collapse.
– Five more bodies have been pulled from the rubble of today's building collapse in downtown Philadelphia, bringing the death toll to six, reports AP. The collapse happened when a building under demolition unexpectedly came crashing down this morning, destroying an adjoining Salvation Army thrift shop and crushing some who were browsing in the store, reports the Inquirer. Another 14 people were injured, including one woman who was found 12 hours after the collapse. It's still not clear what caused the collapse, or what stage the demolition process was at when it occurred, reports the Philadelphia Inquirer. Police used the term "industrial accident," and an OSHA spokesperson says the agency was told it was an accident at a demolition site, reports CNN. "There are demolitions taking place on a daily basis," says Mayor Michael Nutter. "So it's not unusual that there would be people in a store or building next to where a demolition is taking place." The buildings were located in a heavily-trafficked part of the city, near the popular Mutter Museum.