A scaffold being used on the John Hancock Center in Chicago collapsed in high winds last Saturday, killing three women. Nanatta Cameron, Jill Semplinski-Nelson, and Melissa Cook were driving on a street outside the high rise when the scaffold fell, crushing their cars. Buildings Commissioner Mary Richardson-Lowry accused the contractor operating the scaffold, Denver-based AMS Architectural Technologies, of failing to attach the equipment to either the base or top of the building, a procedure required during inclement weather. Wind gusts were recorded at nearly sixty miles per hour at the time of the accident. A spokesperson for AMS disagreed with the commissioner's accusations, saying that a design error contributed to the scaffolding collapse.