The BBC committed a "serious breach" of media regulations by not revealing that the presenter of a documentary about the Gaza situation was the offspring of a Hamas representative, according to UK media regulator Ofcom.
An inquiry by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had previously apologised, stating there had been "a major oversight in relation to accuracy".
The regulator has instructed the broadcaster to broadcast a peak-time statement about its conclusions.
"Since this amounts to a serious breach of our regulations, we are instructing the broadcaster to transmit a message of our findings against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Risk to Damage Confidence'
The watchdog's announcement said: "Our probe determined that the documentary's omission to reveal that the presenter's male guardian served in a position in the Hamas-controlled administration was substantially inaccurate.
"This implied that the public did not have critical information which may have been extremely pertinent to their evaluation of the presenter and the details he provided.
"Credibility is at the center of the relationship between a television network and its audience, especially for a national broadcasting corporation such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the exceptionally strong levels of confidence that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was withdrawn from the online platform in the month of February after the narrator's personal associations emerged, and in this past July an corporation's own inquiry concluded it breached the organization's editorial guidelines on accuracy.
A corporation official said: "The regulator's decision is in agreement with the findings of the internal assessment, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which corresponds to regulation 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with the authority's determination in complete. We will comply with the penalty as soon as the schedule and language are confirmed."