Mitsubishi Fuso Bus & Truck Corp. became embroiled in another defect-coverup scandal Thursday.

The automaker said design flaws in parts for its large vehicles had been systematically concealed instead of subjected to recalls, resulting in a series of accidents, one of them fatal.

The coverups were carried out between 1996 and 2000, when Mitsubishi Fuso, as it is now known, was the truck and bus division of Mitsubishi Motors Corp., company officials said.