The BBC committed a "major breach" of media regulations by not revealing that the presenter of a programme about Gaza was the offspring of a Hamas representative, according to British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, stating there had been "a significant failing in relation to accuracy".
Ofcom has instructed the broadcaster to broadcast a peak-time announcement about its conclusions.
"Given this constitutes a significant violation of our regulations, we are directing the broadcaster to transmit a statement of our determinations against it on the BBC's second channel at nine o'clock in the evening, with a schedule to be finalised," the regulator stated.
'Risk to Undermine Confidence'
The authority's statement said: "Our probe concluded that the film's omission to reveal that the narrator's male guardian occupied a post in the Hamas-administered authority was significantly deceptive.
"Consequently that the public did not have essential details which may have been extremely pertinent to their judgment of the narrator and the details he shared.
"Confidence is at the center of the bond between a media organization and its audience, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This failing had the possibility to erode the very considerable degrees of credibility that viewers would have invested in a factual film from the broadcaster about the Gaza conflict."
The film was withdrawn from the BBC's streaming service in last February after the narrator's personal associations emerged, and in the month of July an corporation's own inquiry determined it infringed the organization's journalistic standards on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in line with the findings of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which reflects Rule 2.2 of Ofcom's Broadcasting Code.
"We issued an apology for this and we accept the regulator's ruling in full. We will follow the sanction as soon as the date and wording are finalised."
