The BBC committed a "major breach" of industry standards by failing to disclose that the narrator of a documentary about Gaza was the son of a Hamas representative, according to British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has determined that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, noting there had been "a major oversight in relation to accuracy".
Ofcom has ordered the BBC to broadcast a evening announcement about its decisions.
"Since this amounts to a major infringement of our code, we are ordering the broadcaster to broadcast a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a timing to be determined," the statement read.
'Potential to Erode Credibility'
The authority's statement stated: "The inquiry we conducted determined that the documentary's omission to reveal that the voice's parent served in a role in the Hamas-administered authority was significantly deceptive.
"Consequently that the viewers did not have essential details which may have been extremely pertinent to their assessment of the presenter and the content he provided.
"Trust is at the heart of the relationship between a broadcaster and its public, notably for a national broadcasting corporation such as the BBC.
"This error had the potential to undermine the very considerable degrees of confidence that the public would have invested in a documentary produced by the BBC about the Israel-Gaza war."
The documentary was pulled from the BBC's streaming service in the month of February after the narrator's personal associations came to light, and in July an corporation's own inquiry found it infringed the broadcaster's journalistic standards on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in accordance with the conclusions of the internal assessment, that there was a serious error in the documentary in relation to the BBC's Editorial Guidelines on accuracy, which aligns with regulation 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with the authority's determination in complete. We will comply with the penalty as soon as the schedule and wording are determined."
