9/11 wasn't the first attack that Rick Rescorla predicted.
The ex-military man and former police officer also predicted the 1993 bombing that saw Islamic terrorists drive a truck bomb into the unguarded basement of the World Trade Centre.
He'd warned the Port Authority in the years prior about the possibility of that exact scenario. Working in the building as corporate security for Dean Witter, who merged with Morgan Stanley Dean Witter & Co in 1997, he'd already investigated the security situation.
Watch: Bill Van Scoyoc was a Morgan Stanley employee working alongside Rescorla in the World Trade Center. Post continues after video.
But when he sounded his concerns, he was told by the Port Authority to "kiss off," his friend Dan Hill, who fought beside him in Vietnam, recalled to The New Yorker.
Afterwards he and Hill, who was trained in counter-terrorism, worked together to find the culprit and determined that it was likely planned by a radical imam at a mosque in either New York or New Jersey.
Subsequently, followers of Sheikh Omar Abdel Rahman, a radical Muslim cleric in Brooklyn, were eventually convicted.