The BBC committed a "significant breach" of industry standards by failing to disclose that the narrator of a documentary about Gaza was the offspring of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has found that the programme was "materially misleading".
The BBC's director general had earlier expressed regret, saying there had been "a major oversight in relation to truthfulness".
The authority has instructed the broadcaster to broadcast a peak-time statement about its decisions.
"As this represents a major infringement of our rules, we are directing the broadcaster to air a statement of our determinations against it on BBC Two at 9pm, with a schedule to be finalised," the regulator stated.
'Possibility to Undermine Trust'
The watchdog's announcement said: "Our probe found that the documentary's lack of disclosure that the narrator's father held a post in the Hamas-run government was significantly deceptive.
"This implied that the public did not have essential details which may have been extremely pertinent to their assessment of the voice and the content he shared.
"Trust is at the center of the connection between a television network and its viewers, notably for a public service broadcaster such as the BBC.
"This oversight had the potential to erode the significantly high levels of credibility that audiences would have put in a documentary produced by the BBC about the Israel-Gaza war."
The programme was removed from the BBC's streaming service in February after the presenter's personal associations emerged, and in this past July an corporation's own inquiry determined it breached the organization's journalistic standards on truthfulness.
A corporation official stated: "The regulator's decision is in accordance with the findings of the internal assessment, that there was a major oversight in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with the regulator's ruling in full. We will adhere to the sanction as soon as the timing and wording are confirmed."
