Varig 707
Varig on July 11, 1973 crashed in Paris due to an uncontained fire in the aft lavatory, was suspected a smoker started it accidentally.
PROBABLE CAUSE: "A fire which appears to have started in the washbasin unit of the aft right toilet. It was detected because smoke had entered the adjacent left toilet. The fire may have been started by an electrical fault or by the carelessness of a passenger. The difficulty in locating the fire made the actions of cabin personnel ineffective. The flight crew did not have the facilities to intervene usefully from the cockpit against the spread of the fire and the invasion of smoke."