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 report notes that in the past three years, at least 173 people have been killed and more than 700 wounded in 17 ramming attacks around the world. Of the 17 attacks, 13 resulted in fatalities. Five were carried out in France both before and after the Nice attack and four took place in Israel.
The jump in the frequency of attacks appear to coincide with an ISIS leader's call in September 2014 to use whatever weapons or tools, including vehicles, available to kill "infidels.