Why wasn't Christmas bomber on no-fly list?

The Takeaway
The World
The man who attempted to detonate explosives aboard Northwest Flight 253 had been reported to the U.S. embassy in Abuja, Nigeria, by his father, a prominent Nigerian banker who expressed concerns that his son was becoming radicalized. Bruce Hoffman, a terrorism expert and professor of security studies at Georgetown University, says U.S. security still needs improvement.
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