The BBC was found to have committed a "serious breach" of broadcasting rules by not revealing that the presenter of a film about Gaza was the son of a Hamas official, according to regulatory body Ofcom.
An probe by the media regulator into the documentary titled Gaza: How to Survive a Warzone has concluded that the programme was "substantially inaccurate".
The head of the BBC had already issued an apology, stating there had been "a serious error in relation to factual correctness".
The regulator has instructed the corporation to transmit a prime-time announcement about its conclusions.
"Given this constitutes a serious breach of our regulations, we are ordering the broadcaster to broadcast a announcement of our conclusions against it on BBC2 at nine o'clock in the evening, with a date to be confirmed," the regulator stated.
'Risk to Undermine Trust'
The watchdog's statement said: "Our investigation found that the documentary's omission to reveal that the narrator's male guardian served in a position in the Hamas-run authority was materially misleading.
"It meant that the viewers did not have critical information which may have been extremely pertinent to their judgment of the narrator and the content he presented.
"Credibility is at the core of the connection between a broadcaster and its public, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to erode the exceptionally strong degrees of confidence that audiences would have placed in a documentary produced by the BBC about the Israel-Gaza war."
The programme was pulled from the BBC's streaming service in last February after the narrator's family links were revealed, and in this past July an internal BBC review determined it infringed the broadcaster's journalistic standards on factual correctness.
A corporation official stated: "The authority's determination is in agreement with the conclusions of Peter Johnston's review, that there was a major oversight in the programme in relation to the corporation's content standards on truthfulness, which aligns with regulation 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we accept Ofcom's decision in its entirety. We will follow the sanction as soon as the timing and language are determined."
