The BBC committed a "significant breach" of media regulations by not revealing that the voice of a documentary about the Gaza conflict was the child of a Hamas official, as determined by regulatory body Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has found that the film was "significantly deceptive".
The chief executive of the broadcaster had previously apologised, noting there had been "a major oversight in relation to truthfulness".
The authority has instructed the broadcaster to broadcast a evening statement about its conclusions.
"Since this amounts to a major infringement of our regulations, we are directing the BBC to broadcast a announcement of our determinations against it on BBC Two at 21:00, with a schedule to be finalised," the regulator stated.
'Possibility to Damage Credibility'
The watchdog's announcement stated: "Our probe determined that the film's lack of disclosure that the voice's male guardian served in a role in the Hamas-administered authority was materially misleading.
"This implied that the public did not have critical information which may have been extremely pertinent to their evaluation of the voice and the information he provided.
"Confidence is at the center of the relationship between a broadcaster and its public, particularly for a public service broadcaster such as the BBC.
"This failing had the potential to damage the very considerable levels of confidence that audiences would have put in a BBC factual programme about the conflict in Gaza."
The programme was pulled from the BBC's streaming service in the month of February after the presenter's family links were revealed, and in July an broadcaster's internal assessment concluded it breached the organization's editorial guidelines on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in agreement with the results of the corporation's inquiry, that there was a major oversight in the film in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in full. We will comply with the penalty as soon as the schedule and wording are finalised."
