“This misinformation doesn’t just exist on people’s internet browsers and on people’s phones. It has real world impact,” he said.

Britain’s worst attack on children was in 1996 when 43-year-old Thomas Hamilton shot and killed 16 kindergartners and their teacher in a school gymnasium in Dunblane, Scotland. The United Kingdom subsequently banned the private ownership of almost all handguns.

While knives are used in about 40% of homicides each year, mass stabbings are unusual. But a recent rise in knife crime has stoked anxieties and led to calls for the government to do more to clamp down on bladed weapons, by far the most commonly used instruments in U.K. homicides.