We don't know where they're from, who they are. They could be ISIS. They could be ISIS related. We just don't learn.
Donald Trump Would Shut Borders in Case of US Attack, Calls for Surveillance of Muslims, Advocates Waterboarding
Passengers walk inside the metro system after explosions in Brussels Tuesday, March 22, 2016. Authorities locked down the Belgian capital on Tuesday after explosions rocked the Brussels airport and subway system, killing a number of people and injuring many more. Belgium raised its terror alert to its highest level, diverting arriving planes and trains and ordering people to stay where they were. Airports across Europe tightened security. Evan Lamos via AP
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