Freed aid worker: Happy to be alive

Four aid workers, who were abducted from Kenya's vast Dadaab refugee complex near the Somali border last week, arrive in Nairobi.
Four aid workers, who were abducted from Kenya's vast Dadaab refugee complex near the Somali border last week, arrive in Nairobi.

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    Freed aid worker: Happy to be alive

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Four aid workers are free after a shoot-out in southern Somalia. CNN's David McKenzie reports.