On Saturday, pedestrians on London Bridge were hit by a white van in a terrorist attack that killed 7 people and injured 48 others.
The van attack, which was followed by stabbings, is the third to use a vehicle as a weapon since March, suggesting a new trend in terrorism. The attack was claimed by ISIS, and took place just hours after an Islamic State outlet used an encrypted messaging app to encourage attacks using vehicles.
The simplicity of vehicular attacks makes them easier to carry out and harder to prevent than more elaborate plans. So if ISIS’ reach is so far, why aren’t they happening every day?
Brian Michael Jenkins, senior advisor to the president of the Rand Corporation and one of the nation's leading experts on terrorism and homeland security; he tweets @BrianMJenkins