Correction: In the original audio for this story, the suicide bomber married to Samantha Lewthwaite was said to have blown up a train in Britain. To clarify, Germaine Lindsay was one of four bombers who attacked London's metro system in 2005.
Kenyans are feeling helpless a week after gunmen stormed a Nairobi mall in a carefully orchestrated terrorist attack. NPR's Gregory Warner looks at what we now know about those terrorists, including claims that a British woman was among the attackers.
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