Car-Ramming Attacks Have Increased Over the Years. Here’s Why They’re So Hard to Prevent

A driver on Monday evening plowed a minivan into a sea of hundreds of thousands of soccer fans celebrating Liverpool’s victory in the Premier League, injuring more than 45 people, including at least four children.

Fans wrapped in red scarves and dressed in the English team’s jerseys were at a victory parade the day after the season’s end when a grey minivan turned onto the parade route around 6 p.m. local time. The vehicle struck a man, throwing him into the air, then plowed through a larger group of people before coming to a stop...