CAROL LIN, CNN ANCHOR: CNN's David Ensor has been also been following the Khalid connection, and he joins us now from Washington. David, how important do you think that U.S. officials think this man was in the plot of September 11?</s>DAVID ENSOR, CNN CORRESPONDENT: Well, they're now saying they have -- the new information suggests he was really very important. He may have been instrumental in the plot. He may even have been pivotal to the whole plan. He was not, however, as some have incorrectly reported, the mastermind of the plot. At least that's according to the officials I'm talking to.</s>LIN: So, where are these officials getting their information about him from?</s>ENSOR: The new information started by coming from Abu Zubaydah. He, of course, as you know, is the senior al Qaeda official or officer who was -- who has been in U.S. hands for months now and has been being interrogated. He is trying to play up the role, of course, of other people in the September 11 plot and play down his own role. So everything he says, officials say, is taken with skepticism. But in this case, he's given some specific information about Khalid's role -- Khalid Shaikh Mohammed's role -- that has been possible to corroborate with other intelligence information.</s>LIN: Has he indicated where Khalid Shaikh Mohammed might be?</s>ENSOR: If he has, that is not something that they are telling us. What officials say is they believe this man is, like Osama bin Laden, probably, either in Afghanistan or in Pakistan, probably in the border area.</s>LIN: All right. So how difficult is it going to be to catch him, then?</s>ENSOR: Just as difficult as bin Laden has been. These are very elusive people. But there are a number of these leaders that are still on the most-wanted list.</s>LIN: All right. Thank you very much. David Ensor, with the latest on that investigation. Plan 9/11 Attacks>
Al Qaeda Lieutanant Says Khalid Shaikh Mohammed Helped Plan 9/11 Attacks