The BBC committed a "significant breach" of media regulations by failing to disclose that the voice of a documentary about Gaza was the offspring of a Hamas official, according to UK media regulator Ofcom.
An inquiry by Ofcom into the programme Gaza: How to Survive a Warzone has determined that the programme was "substantially inaccurate".
The chief executive of the broadcaster had earlier expressed regret, saying there had been "a serious error in relation to accuracy".
The regulator has ordered the broadcaster to broadcast a prime-time announcement about its decisions.
"As this represents a significant violation of our regulations, we are instructing the corporation to broadcast a message of our conclusions against it on BBC2 at nine o'clock in the evening, with a timing to be determined," it said.
'Potential to Damage Trust'
The authority's report stated: "Our probe found that the film's lack of disclosure that the voice's parent held a post in the Hamas-controlled government was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the content he presented.
"Credibility is at the center of the bond between a broadcaster and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This failing had the risk to damage the significantly high amounts of confidence that the public would have invested in a documentary produced by the BBC about the Gaza conflict."
The film was pulled from the online platform in the month of February after the narrator's family links emerged, and in the month of July an internal BBC review determined it violated the broadcaster's content policies on truthfulness.
A representative for the broadcaster commented: "The regulator's decision is in accordance with the results of the corporation's inquiry, that there was a major oversight in the documentary in relation to the broadcaster's journalistic policies on truthfulness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in its entirety. We will follow the penalty as soon as the schedule and wording are finalised."
