The federal government has concluded there's a new leaker exposing national security documents in the aftermath of surveillance disclosures by former NSA contractor Edward Snowden, U.S. officials tell.
Proof of the newest leak comes from national security documents that formed the basis of a news story published Tuesday by the Intercept, the news site launched by Glenn Greenwald, who also published Snowden's leaks.
The Intercept article focuses on the growth in U.S. government databases of known or suspected terrorist names during the Obama administration.
The article cites documents prepared by the National Counterterrorism Center dated August 2013, which is after Snowden left the United States to avoid criminal charges.
Greenwald has suggested there was another leaker. In July, he said on Twitter "it seems clear at this point" that there was another.
Government officials have been investigating to find out that identity.
In a February interview with CNN's Reliable Sources, Greenwald said: "I definitely think it's fair to say that there are people who have been inspired by Edward Snowden's courage and by the great good and virtue that it has achieved."
He added, "I have no doubt there will be other sources inside the government who see extreme wrongdoing who are inspired by Edward Snowden."
It's not yet clear how many documents the new leaker has shared and how much damage it may cause.
So far, the documents shared by the new leaker are labeled "Secret" and "NOFORN," which means it isn't to be shared with foreign government.
That's a lower level of classification than most of the documents leaked by Snowden.
Government officials say he stole 1.7 million classified documents, many of which were labeled "Top Secret," a higher classification for the government's most important secrets.