Said Kouachi, left, and Cherif Kouachi are suspects in the Paris attack.
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Tracking the Kouachi brothers' time in Yemen
What do we know about the time that the Kouachi brothers spent in Yemen and who they may have coordinated with? CNN's Nick Paton Walsh reports.
01:34 - Source: CNN
Terror attack in Paris 15 videos
Said Kouachi, left, and Cherif Kouachi are suspects in the Paris attack.
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Tracking the Kouachi brothers' time in Yemen
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Le Monde: Paris attacks were coordinated
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'They started to shoot, then I lay down on the floor'
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'Charlie Hebdo does not stop people from believing'
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A look through Paris' 'no-go' zones
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Who inspired the Paris terrorists?
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Was Coulibaly part of a terror cell?
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Paris Mayor: We'll sue Fox News after they 'insulted'
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Hayat Boumedienne
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Chasing the trail of Hayat Boumeddiene
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Fear of radicalization in French prisons
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Cashing in on the Paris attacks
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Guns on streets of Paris despite strict laws
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Pope: There are limits to free expression
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Was U.S. intelligence blind to AQAP plot to attack Paris?
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Who is AQAP terror group commander al-Ansi?
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