A 21-year-old US Air Force National Guard employee has been arrested over the leak of highly sensitive US defence and intelligence documents.

Jack Teixeira is reported to be the leader of an online gaming chat group where the files leaked in recent months.

At least 50 but perhaps more than 100 secret documents were posted on social media app Discord.

The documents included sensitive information about the war in Ukraine, as well as on US allies and adversaries across the globe.

US defence officials have described the leak as a “very serious risk” to national security.

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