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Thirty-one people were killed and 270 wounded in Tuesday's bombing attacks at the Brussels airport and on a subway train in Belgium's capital.
On this week's Politics Unplugged, Dr. Nader Hashemi of the University of Denver's Center for Middle East Studies talked with Marshall Zelinger about the motives behind the attacks and the possibility of future attacks on American soil.
Politics Unplugged airs Sundays at 4 p.m. on Denver7.