![FBI photo of Khalid Shaikh Mohammed.](https://npr.brightspotcdn.com/dims4/default/e47e041/2147483647/strip/true/crop/140x187+0+0/resize/880x1175!/quality/90/?url=https%3A%2F%2Fmedia.npr.org%2Fnews%2Fspecials%2Fkmohammed%2Fkmohammed140-e7d3d0f79b2ab5c20739b08824beca0fb30f0e48.jpg)
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NPR's Michele Kelemen reports the Bush administration believes the arrest in Pakistan over the weekend of Khalid Shaikh Mohammed, the alleged mastermind of the Sept. 11 attacks, is a major blow to al Qaeda -- but experts say it is not a mortal blow.
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