The White House is hosting a summit on counterterrorism this week.
The summit will focus on fighting extremism, particularly on social media. That’s part of the UK counterterror strategy as well. But security forces are working with different toolboxes on opposite sides of the Atlantic.
In the United States, social media activity showing an interest in or sympathy to a group on America’s foreign terrorist list, like the Islamic State (IS), can lead police to evidence of a crime plot. That was the case last month, when police arrested an Ohio man named Christopher Lee Cornell accused of planning an attack on the US Capitol.