Terrorist training of Paris attacker puts spotlight on Yemen

Aired: 1/12/2015 | 0:04:41 | Clip
One of the brothers involved in the Paris attacks received al-Qaida training in Yemen. Chief foreign correspondent Margaret Warner joins Gwen Ifill to explain why that country is a hotbed for jihadism, and to examine the competition and cooperation between al-Qaida and the Islamic State.

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