Second leaker in US intelligence, says Glenn Greenwald

The investigative journalist Glenn Greenwald has found a second leaker inside the US intelligence agencies, according to a new documentary about Edward Snowden. Towards the end of filmmaker Laura Poitras’s portrait of Snowden -- titled Citizenfour, the label he used when he first contacted her -- Greenwald is seen telling Snowden about a second source. Snowden, at a meeting with Greenwald in Moscow, expresses surprise at the level of information apparently coming from this new source. Greenwald, fearing he will be overheard, writes the details on scraps of paper.