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The dark psychology of ISIS' 'poison Kool-Aid'
As a massive manhunt is underway in Brussels, author Anne Speckhard, a terrorism expert, explains the radicalization process and more of what she's learned from speaking to ISIS defectors and their family members.
Terror attack in Brussels
Mohamad Abrini charged with 'terrorist murders'02:34
Prosecutor: Mohamed Abrini is 3rd man at airport05:02
Belgian prosecutors confirm suspect05:17
Five new suspects arrested in Brussels02:59
Prosecutor confirms Brussels attack arrest02:23
New arrests in Brussels investigation01:29