I remember, after 9-11, there were people who worked in the WTC that said weeks? months? before 9-11 they would come in in the mornings and their desks would be covered in dust. Others saying that they would be locked out on random days so that maintenance could be done on their floor.
I'm not going to try to look for reliable sources. But I do remember there being lots of WTC workers giving evidence that there were many indications that explosives could have been put in place shortly before 9-11.
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