The BBC committed a "major breach" of media regulations by failing to disclose that the narrator of a film about the Gaza conflict was the son of a Hamas representative, as determined by UK media regulator Ofcom.
An investigation by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The chief executive of the broadcaster had already issued an apology, stating there had been "a serious error in relation to truthfulness".
The authority has instructed the BBC to broadcast a prime-time declaration about its findings.
"Since this amounts to a serious breach of our regulations, we are ordering the corporation to broadcast a message of our conclusions against it on BBC Two at nine o'clock in the evening, with a date to be confirmed," it said.
'Possibility to Erode Credibility'
The regulator's statement said: "Our investigation concluded that the documentary's failure to disclose that the voice's father served in a post in the Hamas-run government was materially misleading.
"Consequently that the public did not have critical information which may have been extremely pertinent to their assessment of the voice and the details he shared.
"Confidence is at the center of the connection between a broadcaster and its audience, notably for a state-funded media outlet such as the British Broadcasting Corporation.
"This oversight had the risk to undermine the very considerable amounts of trust that viewers would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from the online platform in February after the narrator's familial connections emerged, and in the month of July an internal BBC review concluded it infringed the organization's editorial guidelines on accuracy.
A representative for the broadcaster stated: "The Ofcom ruling is in line with the results of the internal assessment, that there was a significant failing in the programme in relation to the BBC's Editorial Guidelines on truthfulness, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in full. We will follow the directive as soon as the date and wording are confirmed."
