David, T, is right on the money; the enormous cloud of black Smoke is a big clue. Gasoline burns clean and jet fuel will give oodles of Black smoke. Hopefully, there will be photos from people that saw the plane as it came in to land. A lady that saw the plane fly over her house said that one propeller was not turning.
No matter, the B-17’s could withstand head-on cannon and machine gun fire, at close range, and not even cough no’r did the young 20 year old pilots even blink. Something really bad had to have happened to bring this B-17 down. RIP, to the passengers and crew.