The BBC committed a "major breach" of broadcasting rules by not revealing that the narrator of a film about Gaza was the offspring of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the film was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a major oversight in relation to factual correctness".
Ofcom has ordered the BBC to transmit a evening declaration about its findings.
"Since this amounts to a major infringement of our rules, we are ordering the BBC to broadcast a announcement of our conclusions against it on BBC Two at 9pm, with a schedule to be confirmed," it said.
'Potential to Undermine Trust'
The watchdog's report declared: "Our probe determined that the programme's lack of disclosure that the voice's father held a position in the Hamas-run authority was substantially inaccurate.
"This implied that the audience did not have critical information which may have been very significant to their assessment of the voice and the content he presented.
"Trust is at the core of the connection between a media organization and its viewers, particularly for a national broadcasting corporation such as the BBC.
"This error had the possibility to damage the exceptionally strong degrees of credibility that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The film was withdrawn from the online platform in last February after the narrator's family links were revealed, and in the month of July an corporation's own inquiry determined it violated the corporation's editorial guidelines on accuracy.
A BBC spokesperson stated: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a serious error in the film in relation to the corporation's content standards on truthfulness, which aligns with Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the date and wording are finalised."
