On August 10, 2015, the IC inspector general said that two of the 40 emails in the sample were "Top Secret/Sensitive Compartmented Information" and subsequently given classified labels of "TK" (for "Talent Keyhole," indicating material obtained by aerial or space-based imagery sources and NOFORN). One is a discussion of a news article about a U.S. drone strike operation. The second, he said, either referred to classified material or else was "parallel reporting" of open-source intelligence, which might still be classified by the government "owning agency" that sourced the information by secret means even though the same information was also available in the public domain. Clinton's presidential campaign and the State Department disputed the letter, and questioned whether the emails had been over-classified by an arbitrary process. According to an unnamed source, a secondary review by the CIA and the National Geospatial-Intelligence Agency endorsed the earlier inspectors general findings concluding that the emails (one of which concerned North Korea's nuclear weapons program) were "Top Secret" when received by Clinton through her private server in 2009 and 2011, a conclusion also disputed by the Clinton campaign.