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robertson.9/11.petn.al.qaeda.ace_00002815
robertson.9/11.petn.al.qaeda.ace_00002815

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    Al Qaeda's bomb-making ace

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Al Qaeda's bomb-making ace

CNN's Nic Robertson looks at al Qaeda's bomb makers and why PETN has become their favorite high explosive.

Al Qaeda's bomb-making ace

CNN's Nic Robertson looks at al Qaeda's bomb makers and why PETN has become their favorite high explosive.