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FBI veteran: 'This was an intelligence failure'
MSNBC's Brian Williams speaks to FBI veteran Don Borelli of the New York Joint Terrorism Task Force to examine how the fatal attacks in Brussels, Belgium unfolded and whether they could've been prevented.
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