The 23-year-old Nigerian who was arrested Christmas Day for trying to blow up a Northwest aircraft as it prepared to land in Detroit was known to U.S. authorities. Umar Farouk Abdulmutallab had been placed on a watch list after his father notified U.S. authorities in November about his son's extreme views. Newsweek investigative correspondent Mark Hosenball, who has been reporting on how Abdulmutallab was able to elude security officials, offers his insight.
How Did Terror Suspect Elude Security?
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