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Pete Williams: Security at US transportation hubs will be more visible

03:29

NBC justice correspondent Pete Williams tells TODAY that a big question about the attacks in Belgium is whether they were planned in advance, or if they are a response to the arrest of Salah Abdeslam, a suspect in last year’s Paris terror attacks. He says that domestic officials say that there is no sign that similar attacks are planned in the U.S., but security at American transportation hubs will be more visible.