The BBC engaged in a "serious breach" of broadcasting rules by failing to disclose that the presenter of a documentary about the Gaza conflict was the son of a Hamas official, as determined by UK media regulator Ofcom.
An probe by the broadcasting watchdog into Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The chief executive of the broadcaster had already issued an apology, noting there had been "a serious error in relation to factual correctness".
The authority has instructed the corporation to transmit a prime-time statement about its decisions.
"Given this constitutes a significant violation of our regulations, we are directing the BBC to transmit a message 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 statement read.
'Risk to Undermine Trust'
The regulator's statement said: "Our investigation determined that the film's omission to reveal that the presenter's male guardian held a role in the Hamas-administered administration was materially misleading.
"This implied that the viewers did not have critical information which may have been highly relevant to their assessment of the voice and the details he shared.
"Credibility is at the center of the relationship between a television network and its viewers, notably for a state-funded media outlet such as the BBC.
"This oversight had the risk to undermine the significantly high amounts of confidence that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The programme was pulled from iPlayer in February after the narrator's personal associations came to light, and in July an corporation's own inquiry determined it breached the organization's journalistic standards on accuracy.
A BBC spokesperson commented: "The authority's determination is in accordance with the results of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which reflects Rule 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in full. We will follow the penalty as soon as the timing and language are confirmed."
