TSA Report Warns Against Truck Ramming Attacks By Terrorists

Truck owners and truck rental agencies in the U.S. must be "vigilant" about the increasing frequency of "ramming attacks" by terrorists using vehicles as killing machines, according to a new Transportation Security Administration report obtained exclusively by NBC News.

The unclassified report warns owners, operators and rental agencies to protect their vehicles from theft. Entitled "Vehicle ramming attacks: Threat landscape, indicators and counter measures," the report was sent Tuesday to local law enforcement agencies and private companies working with the Department of Homeland Security.

"No community, large or small, rural or urban, is immune to attacks of this kind by organized or 'lone wolf' terrorists," the report noted.

Based on a study of the attacks, the TSA said particularly vulnerable locations include those where "large numbers of people congregate, including parades and other celebratory gatherings, sporting events, entertainment venues, or shopping centers." Moreover, it suggested that several of the attacks had been planned for such events.

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