Arrested, freed, flagged: How top ISIS operative slipped through the net
Updated 1622 GMT (0022 HKT) March 16, 2017
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- Oussama Atar is wanted by authorities in connection with Paris, Brussels terror attacks
- Andre Jacob, a retired anti-terror expert met him in 2006; says there was an opportunity to stop Atar a decade ago
(CNN)Authorities missed an opportunity a decade ago to stop a key ISIS operative thought to be behind the Paris and Brussels attacks, a former Belgian intelligence officer says.