The BBC committed a "significant breach" of media regulations by not revealing that the presenter of a film about the Gaza conflict was the offspring of a Hamas administrator, according to British broadcasting authority Ofcom.
An probe by Ofcom into the programme Gaza: How to Survive a Warzone has concluded that the film was "significantly deceptive".
The head of the BBC had already issued an apology, saying there had been "a serious error in relation to accuracy".
The authority has instructed the BBC to air a prime-time announcement about its decisions.
"Since this amounts to a major infringement of our code, we are instructing the corporation to air a statement of our determinations against it on the BBC's second channel at 9pm, with a schedule to be determined," the regulator stated.
'Possibility to Damage Credibility'
The regulator's announcement stated: "Our probe determined that the film's omission to reveal that the presenter's parent served in a position in the Hamas-controlled authority was materially misleading.
"It meant that the audience did not have vital facts which may have been highly relevant to their judgment of the narrator and the content he provided.
"Credibility is at the core of the relationship between a broadcaster and its public, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This oversight had the risk to damage the very considerable degrees of trust that audiences would have placed in a documentary produced by the BBC about the conflict in Gaza."
The documentary was pulled from the BBC's streaming service in last February after the narrator's personal associations came to light, and in the month of July an broadcaster's internal assessment concluded it breached the corporation's content policies on truthfulness.
A representative for the broadcaster said: "The authority's determination is in accordance with the results of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on factual correctness, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we comply with Ofcom's decision in complete. We will adhere to the sanction as soon as the timing and language are finalised."