The BBC committed a "serious breach" of industry standards by not revealing that the narrator of a film about the Gaza situation was the offspring of a Hamas representative, according to UK media regulator Ofcom.
An inquiry by Ofcom into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The head of the BBC had previously apologised, saying there had been "a serious error in relation to truthfulness".
The regulator has directed the BBC to transmit a prime-time announcement about its findings.
"As this represents a serious breach of our rules, we are instructing the broadcaster to transmit a statement of our conclusions against it on BBC Two at 21:00, with a timing to be determined," the regulator stated.
'Risk to Erode Credibility'
The watchdog's report said: "Our probe concluded that the programme's failure to disclose that the voice's father served in a position in the Hamas-administered administration was substantially inaccurate.
"Consequently that the audience did not have essential details which may have been extremely pertinent to their evaluation of the narrator and the content he provided.
"Credibility is at the heart of the bond between a broadcaster and its audience, notably for a public service broadcaster such as the BBC.
"This oversight had the risk to undermine the exceptionally strong amounts of confidence that the public would have placed in a factual film from the broadcaster about the conflict in Gaza."
The programme was withdrawn from iPlayer in the month of February after the narrator's family links emerged, and in July an broadcaster's internal assessment found it violated the corporation's content policies on accuracy.
A BBC spokesperson commented: "The Ofcom ruling is in accordance with the conclusions of the internal assessment, that there was a significant failing in the programme in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we comply with Ofcom's decision in complete. We will adhere to the directive as soon as the timing and wording are determined."
