“Irresponsible construction methods” and a “blatant disregard” for safety led to the fatal collapse in January of an airplane hangar being built in Boise, Idaho, according to the U.S. Dept. of Labor Occupational Safety and Health Administration. The agency on July 26 cited the contractor, Big D Builders Inc., for one willful and three serious alleged violations of safety regulations and proposed it pay nearly $200,000 in fines.

Three workers were killed in the collapse, including Craig Durrant, a co-owner of the Meridian, Idaho-based contractor. Nine other workers were injured—eight seriously, according to OSHA.