Revealed: Second NSA leaker exists in US intelligence

American journalist Glenn Greenwald talked about the second leaker at the end of the film during a meeting between him and Snowden in Moscow, The Guardian reported.
 
The documentary, Citizenfour, from filmmaker Laura Poitras, is about former NSA contractor Snowden which had its world premiere on Friday.
 
Snowden “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,” according to The Guardian.
 
Greenwald also disclosed that 1.2 million Americans are currently on a government watch-list.
 
In July, Greenwald suggested that another leaker was providing the US National Security Agency’s documents to the media.
 
In a tweet, Greenwald wrote that the existence of a second leaker after Snowden seemed "clear at this point.”
 
Snowden began leaking classified intelligence documents in June 2013, revealing the extent of the NSA's spying activities.
 
He revealed that the spy agency has been collecting the phone records of millions of Americans and foreign nationals as well as political leaders around the world.
 
Following the revelations, Snowden fled the United States to avoid espionage charges.
 
In August 2013, Russia granted him asylum for one year and this summer the country granted him permission to stay in Moscow until August 2017.