The BBC engaged in a "major breach" of industry standards by failing to disclose that the presenter of a programme about the Gaza conflict was the offspring of a Hamas representative, according to regulatory body Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had previously apologised, saying there had been "a significant failing in relation to accuracy".
Ofcom has instructed the broadcaster to air a prime-time statement about its conclusions.
"As this represents a significant violation of our code, we are directing the broadcaster to transmit a announcement of our conclusions against it on the BBC's second channel at nine o'clock in the evening, with a timing to be determined," the statement read.
'Risk to Damage Credibility'
The authority's announcement stated: "The inquiry we conducted found that the film's omission to reveal that the voice's father held a post in the Hamas-administered administration was materially misleading.
"Consequently that the public did not have vital facts which may have been very significant to their assessment of the presenter and the information he shared.
"Trust is at the center of the connection between a media organization and its public, notably for a national broadcasting corporation such as the BBC.
"This failing had the possibility to undermine the significantly high amounts of trust that viewers would have put in a factual film from the broadcaster about the Israel-Gaza war."
The film was removed from the BBC's streaming service in last February after the narrator's personal associations emerged, and in July an corporation's own inquiry concluded it infringed the broadcaster's content policies on accuracy.
A BBC spokesperson commented: "The authority's determination is in accordance with the results of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which aligns with clause 2.2 of the regulator's media standards.
"We have apologised for this and we accept Ofcom's decision in full. We will follow the directive as soon as the schedule and wording are determined."
