Officials say files and documents on computers and cd-roms seized from Khalid Shaikh Mohammed show that he met with Osama Bin Laden in Pakistan last month.

"There is now no doubt that he is alive and well," a senior Pakistani government official said of bin Laden in an interview. "We have documents that show he is alive and in this region."

.... a second Pakistani official said Mohammed had told his captors during the raid of meeting with bin Laden a month ago at a site that Mohammed refused to specify.

"Praise be to Allah, our sheikh is alive," the official quoted Mohammed as saying. "I met him only one month ago."

.... Material seized in the raid has been shipped in boxes to Washington, where investigators are poring over it. Experts consulting in the case include translators, computer specialists, fingerprint examiners and other scientific analysts.

As to who turned Mohammed into authorites, Pakistani officials had this to say:

A significant detail emerged on Wednesday about events leading to the Rawalpindi raid. The senior Pakistani official suggested that Mohammed was betrayed by someone inside al-Qaida. He also noted the American government's offer of $25 million for information leading to his capture. "I'm not going to tell you how we captured him," the official said, "but Khalid knows who did him in."