Rescue workers looked for survivors after a four-story building under demolition collapsed into a neighboring thrift store, killing six people.
Philadelphia Building Collapse

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In this photo provided by Jordan McLaughlin, a dust cloud rises as people run from the scene of a building collapse on the edge of downtown Philadelphia, Pennsylvania, June 5, 2013.

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Rescue personnel search the scene of a building collapse in Philadelphia, Pennsylvania, June 5, 2013.

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Rescue personnel evacuate an injured person from the scene of a building collapse in Philadelphia, Pennsylvania, June 5, 2013.

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Rescue personnel search the scene of a building collapse in Philadelphia, Pennsylvania, June 5, 2013.