TSA warns of possible vehicle ramming attacks

The Transportation Security Administration is warning of the threat of possible ramming attacks involving large vehicles.
In a report, the TSA describes such attacks as “unsophisticated,” but says that they could be carried out with “minimal planning and training.”
The report specifically singles out "events that draw large groups" as an "attractive vehicle ramming target."
The report notes that "from 2014 through 2017, terrorists carried out 17 known vehicle ramming attacks worldwide, resulting in 173 fatalities and 667 injuries."