Last week, classified U.S. military documents largely about the Ukraine war started circulating around the internet and making headlines. But the files appear to have started out on Discord, a platform mostly known for its popularity with gamers, where some were posted months ago.

And by Thursday afternoon, the FBI had swooped into a North Dighton, Massachusetts home and arrested Jack Teixeira, a 21-year-old member of the intelligence wing of the Massachusetts Air National Guard.

Today, Julian Borger, a Washington-based world affairs editor with the Guardian, takes us through how and why this leak may have come out, how it compares to past ones and the real world consequences of the breach.