I’m not playing internet sleuth for you, but the September 2009 attack on the NYC subway system is the first one that springs to mind.
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I can name half a dozen instances where the FBI was given actionable intelligence on a terrorist threat and failed to act and more instances where they deliberately falsified evidence or worse, worked with the mob to help commit murders.
LOL. The FBI organized, tracked and encouraged the two shooters at the 2015 Garland TX, “draw Mohammed” event.
They don’t prevent terrorist attacks - they ARRANGE them.
What better way to understand and control opposition to the realm than to be a direct participant in the creation and functioning of it?