>> not clear whether this came from a human intelligence source or somebody inside or close to the isis terrorist group was with able to get information back to handlers in the west or from enhanced surveillance of isis communications. >> reporter: despite the success, the intelligence community taking a potential hit. the "new york times" reports the prague pentagon's inspector general is investigating an allegation that some isis intelligence reports were altered to paint a rosier picture. the pentagon says it knows nothing about it since the ig operates independently. >> the president places a premium on getting an unvarnished assessment from the spell jens community. >> reporter: barbara starr, cnn, the pentagon. our coverage of the virginia tv news crew murders continues. ahead, we will hear from the gunman's former television boss. plus, germany's chancellor