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Explosive 'signature' may help authorities probing Brussels attacks


NBC News analyst Clint Van Zandt, a former FBI profiler, tells TODAY that there is a strong possibility that the “signature” of the explosives used in the Brussels terror attacks may help authorities who are trying to link them to previous terrorism in Europe, along with other forensic evidence and surveillance footage. One key question, he says, is whether the attack was timed on Tuesday as payback for the arrest of Paris terror suspect Salah Abdeslam.