During the night of 7 April 1990, at about 2 a.m. local time, fire broke out and was discovered by a passenger and was brought to the attention of the receptionist. The fire spread from deck 3 to 4 stopping at deck 5. The stairwell and ceilings acted as chimneys for the fire to spread. Although the bulkheads were made of steel structure with asbestos wall boards, a melamine resin laminate was used as a decorative covering and proved extremely flammable in subsequent testing, spreading fire throughout Deck 3. The burning laminates produced toxic hydrogen cyanide and carbon monoxide gases. The fire then spread to Deck 4 and Deck 5.