127 'Tripwires' used by FBI to Nab Bomb Makers
he powerful blasts at the Boston Marathon finish line Monday underscore why the Federal Bureau of Investigation has spent years refining its “tripwire” system for catching would-be bomb makers before they can build a deadly device. For years, federal agents have asked businesses that sell materials useful in making bombs to alert authorities to any suspicious orders. The types of tripwires in place have shifted over the years. In the […]