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1993 World trade center

And today is the anniversary of the 1995 Oklahoma city bombing.

However I am uncertain if a "threat" was ever called in for either.

This is evidence that a called in thread will likely never be real - real attacks aren't called in with warnings.

Just because those didn't come with threats doesn't mean all attacks come without threats. Also it doesn't prove that all threats won't be followed by an attack.

The unibomber is one example. He would send mail bombs if newspapers didn't heed his threats and publish his ramblings.

If you are uncertain if a threat was ever called in for either, how are those answers to my question? I was specifically asking about threats that were first called in, then followed up upon. To the best of my knowledge, neither of those qualify.

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