The BBC committed a "serious breach" of industry standards by omitting to mention that the presenter of a documentary about the Gaza conflict was the child of a Hamas official, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "materially misleading".
The head of the BBC had previously apologised, noting there had been "a significant failing in relation to accuracy".
The regulator has directed the BBC to air a peak-time announcement about its conclusions.
"Given this constitutes a significant violation of our regulations, we are directing the corporation to air a message of our findings against it on the BBC's second channel at 21:00, with a timing to be confirmed," it said.
'Risk to Undermine Credibility'
The watchdog's report said: "Our probe determined that the programme's omission to reveal that the narrator's parent served in a role in the Hamas-administered administration was materially misleading.
"It meant that the audience did not have vital facts which may have been extremely pertinent to their judgment of the narrator and the content he provided.
"Confidence is at the center of the bond between a television network and its viewers, notably for a public service broadcaster such as the BBC.
"This error had the potential to erode the exceptionally strong levels of credibility that the public would have placed in a factual film from the broadcaster about the Israel-Gaza war."
The programme was withdrawn from iPlayer in the month of February after the narrator's familial connections came to light, and in the month of July an broadcaster's internal assessment concluded it breached the corporation's content policies on accuracy.
A BBC spokesperson stated: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the corporation's content standards on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in complete. We will adhere to the penalty as soon as the timing and wording are confirmed."
