A heavy equipment operator who knocked over a brick wall onto an adjacent Salvation Army center killing six people and injuring 12 during a demolition project in downtown Philadelphia pleaded guilty to manslaughter and other charges last week.

Prosecutors have recommended no more than a 10-20 year sentence for the 44-year-old Sean Benschop.

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.

Benschop was also wearing a cast on his right hand and had taken a Percocet and marijuana the day of the collapse.

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