The six contractors working on the $400 million Horseshoe Casino in Cincinnati did not take enough safety precautions to stabilize the building before a concrete pour began, according to findings of the Occupational Safety and Health Administration. The floor collapsed under the weight of the fresh concrete. "The root cause was the lack of the proper amount of fasteners," says Scott Allen, an OSHA spokesman in Chicago. "OSHA issued a citation to the six companies because we feel that they were all directly involved in the erection and should have recognized the lack of proper safety standards." The accident injured 13 workers.