No. Your prior has to be different: how many skyscrapers that were severely damaged by actions and in contexts consistent with the use of explosives had in fact explosives being used in them?
What’s the probability that explosives just happen to have been successfully placed, but not yet detonated in the WTC in any specific hour? Let’s say an expected 1 hour every 10 years → 1/(10 * 365* 24) = 0.0000114
What’s the probability that explosives just happen to have been successfully placed, but not yet detonated in the WTC in any specific hour? Let’s say an expected 1 hour every 10 years → 1/(10 * 365* 24) = 0.0000114