Did the US have prior knowledge of 9-11? What's Your Opinion? Did the US have prior knowledge of 9-11? 63% of Canadians Believe U.S. Had Prior Knowledge of 9/11 Attacks and Did Nothing Half of New Yorkers Believe US Leaders ?Consciously? Failed To Act On 9-11; 66% Call For New Probe of Unanswered Questions by Congress or New York?s Attorney General, New Zogby International Poll Reveals Yes, I believe they had prior knowledge Yes, I believe they had prior knowledge, and were complicit in the event. No, I don't think the government had prior knowledge. I am not sure Show results