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In a bulletin released Friday to U.S. law enforcement officials, the Transportation Security Administration (TSA) is warning of “continued strong terrorist interest” in targeting mass transit systems in the U.S. The 10-page threat assessment, labeled “Unclassified/For Official Use Only” and obtained by NBC News, cautions that the “U.S. mass transit and passenger rail systems are vulnerable to terrorist attacks because they are accessible to large numbers of the public and are notoriously difficult to secure.” Previous rail attacks in Madrid, London and Mumbai “could inspire terrorists to conduct similar attacks in the United States,” the report adds