a. Multiple allied foreign agencies informed the US government of a coming attack in detail, including the manner and likely targets of the attack, the name of the operation (the "Big Wedding"), and the names of certain men later identified as being among the perpetrators.
b. Various individuals came into possession of specific advance knowledge, and some of them tried to warn the US prior to September 11th.
c. Certain prominent persons received warnings not to fly on the week or on the day of September 11th.
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