Pentagon spokesman John Kirby told NBC News there was "no reason to doubt the authenticity" of the clip purporting to show US soldier Sergeant Bowe Bergdahl, who has spent five years in Taliban captivity, being handed back into US custody.
He said: "US officials are currently reviewing the video, but our focus right now is in getting Bergdahl the care he needs."
More top news
A pig that was saved from the slaughterhouse now spends her days creating artworks that sells for up to $2,000.
The formal Brexit process may have begun today - but experts say it may take up to six years to strike a new trade deal with the EU.
International trade lawyer Miriam Gonzalez Durantez says Brexit negotiators need a "360 degree view" to secure a "constructive" deal.