The BBC committed a "serious breach" of industry standards by failing to disclose that the voice of a documentary about the Gaza conflict was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the broadcasting watchdog into the documentary titled Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The head of the BBC had earlier expressed regret, saying there had been "a major oversight in relation to accuracy".
Ofcom has ordered the BBC to transmit a peak-time declaration about its findings.
"Given this constitutes a major infringement of our regulations, we are instructing the BBC to transmit a message of our findings against it on the BBC's second channel at 9pm, with a schedule to be determined," the statement read.
'Risk to Erode Trust'
The watchdog's report declared: "The inquiry we conducted found that the documentary's lack of disclosure that the presenter's parent held a position in the Hamas-controlled administration was significantly deceptive.
"Consequently that the viewers did not have vital facts which may have been very significant to their assessment of the narrator and the information he presented.
"Confidence is at the heart of the bond between a broadcaster and its audience, notably for a national broadcasting corporation such as the British Broadcasting Corporation.
"This failing had the risk to erode the significantly high levels of confidence that the public would have placed in a documentary produced by the BBC about the Gaza conflict."
The film was removed from the BBC's streaming service in February after the presenter's familial connections emerged, and in July an broadcaster's internal assessment concluded it violated the broadcaster's content policies on factual correctness.
A corporation official commented: "The regulator's decision is in line with the findings of Peter Johnston's review, that there was a significant failing in the programme in relation to the corporation's content standards on factual correctness, which aligns with clause 2.2 of Ofcom's Broadcasting Code.
"We expressed regret for this and we agree with the authority's determination in complete. We will adhere to the penalty as soon as the date and wording are confirmed."
