Another group of people that received warnings in advance of the attack were employees of Odigo
Two employees received e-mail messages two hours before the first World Trade Center assault, predicting the attack
OK canceled meetings is one thing - in a building that size many meetings will be canceled, re arranged etc..
Conversely I'm sure if you tried hard enough you could find some unfortunate souls who were due to have a meeting on 10th of sept but had it postponed to the 11th.
But that allegation - that two people received an e-mail warning predicting an attack - come off it - you can't put that out there unless you have some actual evidence?