The BBC was found to have committed a "major breach" of media regulations by failing to disclose that the narrator of a documentary about Gaza was the child of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has concluded that the film was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a major oversight in relation to truthfulness".
The authority has directed the BBC to air a prime-time announcement about its decisions.
"Given this constitutes a serious breach of our code, we are directing the corporation to air a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a date to be finalised," the regulator stated.
'Risk to Undermine Trust'
The regulator's announcement said: "The inquiry we conducted found that the film's lack of disclosure that the narrator's male guardian occupied a position in the Hamas-controlled authority was substantially inaccurate.
"Consequently that the public did not have critical information which may have been very significant to their assessment of the voice and the details he presented.
"Confidence is at the center of the bond between a television network and its audience, especially for a state-funded media outlet such as the BBC.
"This oversight had the potential to damage the significantly high amounts of confidence that viewers would have placed in a factual film from the broadcaster about the Gaza conflict."
The programme was removed from the BBC's streaming service in last February after the narrator's family links emerged, and in July an corporation's own inquiry found it violated the organization's journalistic standards on accuracy.
A corporation official said: "The authority's determination is in accordance with the conclusions of the corporation's inquiry, that there was a significant failing in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which aligns with Rule 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with Ofcom's decision in full. We will comply with the directive as soon as the timing and wording are confirmed."
