The star told Austrailian GQ magazine that he was informed by the American secret service agents informed him of the threat in 2001. Crowe told the magazine that when told of the threat it "was the first conversation in my life that I’d ever heard the phrase al-Qaeda."
He said the plot involved "taking iconographic Americans out of the picture as a sort of cultural-destabilization plan."
According to the actor, the terrorist plans were discovered during a recorded telephone conversation by French police, in either Libya or Algeria.
Crowe said that he initially thought that this was a complex publicity plan to help him win an Oscar. Eventually he realised it was a serious threat.
The star attended the Oscar awards that year under heavy surveillance, and won the award for best actor for his role in Gladiator.
The actor continued to be shadowed by FBI agents during the filming of his next two movies, A Beautiful Mind and Master and Commander.