Detailed text transcripts for TV channel - KGO - 20150417:09:33:00
>> the benefit of being american is he has good paper. that means he's able to travel. he has a u.s. passport. that is gold. law enforcement has been concerned about this travel pattern for quite awhile. >> reporter: mohamud returns to the u.s. in june and authorities have been tracking him for months. the fbi believes he had been completely radicalized expressing support for isis, even downloading images of fighters of the group to his facebook page. >> about 180 americans have joined isis and al qaeda in syria and iraq or have been arrested for trying to do so. this is the first time we beli...
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