The move is part of TSA’s stricter airport security procedures, which included the announcement on Sept. 7 the allocation of $44.8 million for the purchase of 300-millimeter wave Advanced Imaging Technology machines.

The U.S. Transportation Security Administration has fired 28 employees assigned at Hawaii’s Honolulu International Airport because of their failure to properly screen bags before allowing the luggage onto planes.

The agency also suspended 15 other workers, who will be allowed to appeal the decision.

The firing or suspension of the workers, considered one of the biggest in TSA’s history, was the result of a media report in March that TSA officers on the morning shift allowed the bags to be loaded onto flights on nine planes without screening for explosives. The failure appears to have been ongoing for up to four months and involved thousands of checked bags.