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

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

The documents revealed sensitive intelligence about the war in Ukraine and other countries around the world.

Aerial footage showed officers making an arrest at Mr Teixeira's family home on Thursday.

The arrest happened in Dighton, a town of 8,000 people about an hour to the south of Boston.

Footage shows a young man, believed to be Mr Teixeira, walking backwards towards armed FBI officers with his hands raised, before he is handcuffed and led to a car.

The New York Times used interviews and social media clues to identify Mr Teixeira - a member of the intelligence wing of the Massachusetts Air National Guard - before the confirmation of his arrest.

The FBI said in a statement the arrest happened "without incident" and that agents were continuing to investigate at the home.

Starting several months ago, at least 50 but perhaps more than 100 classified documents were posted on Discord - a social media platform popular with gamers.

The documents - which BBC News is examining - contain a range of intelligence assessments about the war in Ukraine, but also sensitive intelligence about countries around the world, including US allies.

A Department of Defense spokesman has said the Pentagon is continuing to work to "understand the scope, scale and impact of these leaks".

On Wednesday, the Washington Post published an interview with one of the members of the chat room where the documents initially appeared.

He described the leaker as a young, charismatic gun enthusiast in his early to mid-20s who works at an unnamed military base.

The Post reported that the man was the leader of a Discord chat room including roughly two dozen members who swapped "memes, offensive jokes and idle chit chat" and prayed and watched movies together.

The members included people from Russia and Ukraine and a number of other countries in Europe, Asia and South America, the paper reported.

At first the leaks were kept inside the small chat room, but in early March members began posting them on other Discord servers, including ones dedicated to the game Minecraft and a Filipino YouTuber.

From there they were posted on the fringe message board 4chan and on the Telegram chat app, particularly on pro-Russia channels. In some cases they were altered to increase Ukrainian casualty counts.

Earlier, while on a trip to Ireland, US President Joe Biden said investigators were close to finding the person who leaked the documents.

"There's a full blown investigation going on, as you know, with the intelligence community and the Justice Department, and they're getting close," Mr Biden told reporters. (BBC)

Update news