The public service broadcaster committed a "serious breach" of industry standards by not revealing that the narrator of a documentary about the Gaza situation was the child of a Hamas representative, according to regulatory body Ofcom.
An investigation by the media regulator into the programme Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The BBC's director general had previously apologised, noting there had been "a major oversight in relation to truthfulness".
The regulator has instructed the corporation to air a prime-time announcement about its decisions.
"Since this amounts to a major infringement of our code, we are instructing the BBC to broadcast a statement of our conclusions against it on BBC Two at 21:00, with a schedule to be finalised," the statement read.
'Potential to Erode Confidence'
The authority's report declared: "Our probe concluded that the film's lack of disclosure that the voice's father held a position in the Hamas-controlled administration was significantly deceptive.
"Consequently that the public did not have essential details which may have been highly relevant to their assessment of the narrator and the details he shared.
"Credibility is at the core of the relationship between a television network and its audience, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to damage the very considerable degrees of credibility that the public would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was removed from the BBC's streaming service in last February after the presenter's family links came to light, and in this past July an broadcaster's internal assessment determined it breached the organization's editorial guidelines on factual correctness.
A corporation official stated: "The Ofcom ruling is in line with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with Ofcom's decision in full. We will adhere to the penalty as soon as the timing and wording are determined."
