The BBC committed a "major breach" of media regulations by not revealing that the presenter of a film about the Gaza situation was the son of a Hamas official, according to UK media regulator Ofcom.
An probe by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had previously apologised, stating there had been "a significant failing in relation to factual correctness".
The regulator has instructed the corporation to air a peak-time announcement about its conclusions.
"As this represents a major infringement of our code, we are ordering the corporation to broadcast a announcement of our findings against it on BBC Two at nine o'clock in the evening, with a date to be determined," the statement read.
'Potential to Undermine Credibility'
The regulator's statement declared: "The inquiry we conducted found that the documentary's failure to disclose that the voice's male guardian held a role in the Hamas-controlled administration was significantly deceptive.
"It meant that the audience did not have critical information which may have been highly relevant to their judgment of the voice and the content he presented.
"Confidence is at the heart of the connection between a media organization and its viewers, especially for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the potential to damage the exceptionally strong amounts of credibility that audiences would have invested in a BBC factual programme about the Israel-Gaza war."
The documentary was pulled from the online platform in last February after the presenter's family links were revealed, and in July an internal BBC review found it violated the broadcaster's content policies on accuracy.
A BBC spokesperson commented: "The authority's determination is in agreement with the results of the internal assessment, that there was a major oversight in the film in relation to the corporation's content standards on accuracy, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will follow the penalty as soon as the date and wording are determined."
