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Philadelphia Fire Commissioner Lloyd Ayers addresses the media
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Philadelphia Fire Commissioner Lloyd Ayers addresses the media alongside Mayor Michael Nutter, left, at the scene of a building collapse in downtown Philadelphia. A four-story building being demolished collapsed Wednesday on the edge of downtown, injuring 12 people and trapping two others, the fire commissioner said. The toll was later revised to six dead and 14 injured. (June 5, 2013)(Credit: AP)

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Philadelphia building collapses

A four-story building being demolished collapsed Wednesday on the edge of downtown Philadelphia, killing at least six people and injuring 14 others, authorities said.