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. http://hosted2.ap.org/APDEFAULT/386c25518f464186bf7a2ac026580ce7/Article_2015-07-21-US--Building%20Collapse/id-eaab02bdae404261901e7ea0d5f89609 http://www.wochit.com This video was produced by Wochit using http://wochit.com