Story highlights The video in question concerned an exchange over talks between the US and Iran

The clip posted on the State Department's website replaced the exchange with a bright white flash

(CNN) The State Department on Thursday revealed the results of a two-month long investigation into what they say was the deliberate editing of a press briefing video -- but the review left many questions unanswered.

"What we were not able to determine was why the edit was made in the first place," State Department spokesman John Kirby told reporters. "There's no evidence to suggest it was made with the intent to conceal information from the public, and while the (video) technician recalls receiving a phone call requesting the edit, there is no evidence to indicate who might've placed that call or why."

The video in question was brought to the department's attention by Fox News reporter James Rosen, who noticed that a noteworthy exchange he'd had with then-spokeswoman Jen Psaki in December 2013 had been removed from the video posted to the department's website.

Rosen had asked Psaki to explain why the administration previously denied talks were taking place between the US and Iran -- talks that subsequently came to light. Psaki, now the White House communications director, admitted the administration lied in order to protect the secrecy of the negotiations.

The full exchange was included in the official briefing transcript, as well as versions of the video posted to the State Department's YouTube channel and a separate Defense Department video database. But the video posted on the State Department's website was altered so the exchange on Iran was replaced with a bright white flash.

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