Now look at this picture of the Mt. Carmel Center during the inferno, and notice that this empty space and swimming pool area immediately behind and to the left of the three story tower is aflame. But, no, Josephine. Swimming pools and bare ground don't burn unless someone applies a flammable agent. Now go through those photos again and look at the color of the smoke. Even the smoke coming from the burning, empty ground immediately behind and to the left of the three story tower .
Black smoke is characteristic of a petroleum fire.
For example, consider this from oil-well fire fighter Red Adiar's web page . Kuwait was stripped and set on fire by the retreating Iraqi troops during the final days of the Gulf War. Black smoke filled the sky . . . Now here is another dead giveaway on the cause of the fire. Military experts say that this explosive phenomena is characteristic of Special Operations demolitions, effected by detonating 55-gallon drums of jet fuel.