El Khazzani, 26, is a Moroccan citizen, Belgium's chief prosecutor told NBC News. The prosecutor said the question now is: Was he working alone or with accomplices, as part of a broader network?
French Interior Minister Brenard Cazeneuve said Saturday that El Khazzani had been previously flagged by Spanish authorities in 2014 for his radical Islamic ties; and he attempted to go to Syria in May, though it's unclear if he was successful, according to the Wall Street Journal.
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