I heard that anecdote about moslem pax lighting a fire on board a Jeddah-bound Saudia Hajj Special. Some hill Paki tried it and set a fire in the cabin which spread throughout the entire craft. The pilot was able to land it at Riyadh, but the fire was so intense that the doors melted into their frames, no rescue was possible and all aboard perished. I did see a burned out craft that had been towed off the runway. After 30 years some of the details are blurry but that’s how I remember it. It MAY have been a PIA craft instead of a Saudia.