You had Senate staffers reviewing CIA documents, and at the same time, the CIA reviewing those same documents to try to get out ahead of any controversy — and to make matters confusing, the Senate staffers then got access to that CIA review document as part of their regular searches. When the CIA was questioned about this Panetta review, they freaked out, wondering how the Senate staffers got their hands on the document, and did what the CIA does: they spied on the Senate staffers‘ computers and network to try to determine how they got the document in the first place.