The BBC was found to have committed a "significant breach" of broadcasting rules by not revealing that the narrator of a documentary about the Gaza conflict was the offspring of a Hamas official, as ruled by UK media regulator Ofcom.
An probe by Ofcom into Gaza: How to Survive a Warzone has concluded that the documentary was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to factual correctness".
The regulator has ordered the broadcaster to broadcast a peak-time announcement about its conclusions.
"As this represents a significant violation of our code, we are instructing the BBC to air a announcement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the regulator stated.
'Possibility to Erode Trust'
The authority's report stated: "The inquiry we conducted concluded that the documentary's failure to disclose that the presenter's male guardian occupied a post in the Hamas-administered administration was significantly deceptive.
"It meant that the public did not have critical information which may have been highly relevant to their evaluation of the presenter and the information he provided.
"Trust is at the center of the connection between a broadcaster and its audience, particularly for a public service broadcaster such as the British Broadcasting Corporation.
"This error had the possibility to damage the exceptionally strong levels of trust that audiences would have invested in a factual film from the broadcaster about the Gaza conflict."
The film was withdrawn from iPlayer in February after the narrator's familial connections came to light, and in July an internal BBC review concluded it breached the corporation's editorial guidelines on accuracy.
A corporation official stated: "The Ofcom ruling is in accordance with the results of the corporation's inquiry, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on truthfulness, which reflects regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we accept Ofcom's decision in complete. We will follow the directive as soon as the schedule and wording are determined."
