“Successful terrorists have shifted their focus in recent years away from attacking airlines to attacking subway and rail systems, according to an analysis of terrorist attacks over a 30-year period from 1982 to 2011 by a leading health and safety researcher.
In his study—‘Has Successful Terror Gone to Ground?’—Professor Arnold Barnett of the Massachusetts Institute of Technology Sloan School of Management writes that strong, statistically significant evidence points to a growing focus of terrorist attacks against ground mass transit.
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Source: Terrorists Have Shifted from Attacking Airlines to Mass Transit: Study