A heavy equipment operator charged in a building collapse that killed six people and injured 12 during a demolition project in downtown Philadelphia pleaded guilty Tuesday to manslaughter and other charges. Authorities say 44-year-old Sean Benschop had previously been warned not to use machinery to demolish an unsupported brick wall. Investigators believe the vibration from his excavator caused a four-story brick wall to collapse onto an adjacent one-story Salvation Army thrift store, burying shoppers and employees in debris. One woman lost both legs after spending nearly 13 hours in the rubble.

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