The BBC engaged in a "significant breach" of industry standards by omitting to mention that the narrator of a film about Gaza was the son of a Hamas administrator, according to UK media regulator Ofcom.
An investigation by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has determined that the film was "materially misleading".
The head of the BBC had earlier expressed regret, noting there had been "a serious error in relation to accuracy".
The authority has instructed the BBC to broadcast a peak-time announcement about its conclusions.
"Given this constitutes a serious breach of our rules, we are ordering the BBC to air a statement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a timing to be confirmed," it said.
'Possibility to Erode Credibility'
The watchdog's statement said: "The inquiry we conducted concluded that the programme's lack of disclosure that the narrator's parent occupied a position in the Hamas-controlled administration was materially misleading.
"Consequently that the audience did not have critical information which may have been very significant to their evaluation of the narrator and the information he presented.
"Credibility is at the core of the connection between a television network and its viewers, particularly for a national broadcasting corporation such as the public broadcaster.
"This oversight had the possibility to damage the very considerable amounts of confidence that audiences would have placed in a BBC factual programme about the Israel-Gaza war."
The programme was pulled from iPlayer in February after the presenter's family links were revealed, and in this past July an internal BBC review concluded it violated the organization's journalistic standards on accuracy.
A representative for the broadcaster stated: "The authority's determination is in line with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the broadcaster's journalistic policies on factual correctness, which reflects regulation 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we accept the authority's determination in complete. We will comply with the directive as soon as the timing and language are finalised."
