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 CNN.

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…

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 who.