ISIS claimed responsibility for the deadly attacks at a subway station and international airport in Brussels on Tuesday. Authorities in many countries responded with increased security around metros and airports as a precaution. Those who study terror tactics say these kinds of operations have become less expensive to pull off.
For all the destruction they cause, bombs are pretty cheap to make, often under a thousand dollars, said Bruce Hoffman, director of Georgetown University’s Center for Security Studies and the author of the book, “Anonymous Soldiers."
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