In a notice on the top 10 list, the FBI described him as "a computer expert" with "above-average knowledge regarding computers, the use of the Internet, and security awareness".
That includes any luck in locating Tsarnaev's laptop computer, which a law enforcement official withknowledge of the investigation had said investigators were looking for.
At any rate, the sheikh can console himself with the knowledge that the metro will be the world's biggest computer-operated train system, and its Union Station will have the world's biggest underground railway concourse.