The BBC was found to have committed a "significant breach" of broadcasting rules by omitting to mention that the presenter of a documentary about the Gaza conflict was the offspring of a Hamas administrator, according to UK media regulator Ofcom.
An inquiry by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a significant failing in relation to truthfulness".
The authority has instructed the broadcaster to air a peak-time declaration about its decisions.
"Given this constitutes a major infringement of our rules, we are instructing the BBC to broadcast a message of our determinations against it on BBC2 at 9pm, with a schedule to be determined," it said.
'Possibility to Damage Credibility'
The regulator's report declared: "The inquiry we conducted determined that the film's omission to reveal that the voice's parent served in a post in the Hamas-administered authority was substantially inaccurate.
"Consequently that the public did not have essential details which may have been very significant to their judgment of the presenter and the information he provided.
"Confidence is at the core of the bond between a broadcaster and its public, particularly for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to erode the very considerable amounts of trust that the public would have invested in a documentary produced by the BBC about the conflict in Gaza."
The film was withdrawn from the BBC's streaming service in last February after the narrator's family links emerged, and in July an broadcaster's internal assessment found it violated the corporation's content policies on factual correctness.
A representative for the broadcaster stated: "The authority's determination is in line with the results of the internal assessment, that there was a significant failing in the programme in relation to the broadcaster's journalistic policies on truthfulness, which corresponds to Rule 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in its entirety. We will follow the sanction as soon as the date and wording are confirmed."
