The BBC was found to have committed a "serious breach" of media regulations by not revealing that the presenter of a programme about Gaza was the son of a Hamas representative, as ruled by UK media regulator Ofcom.
An probe by the media regulator into the programme Gaza: How to Survive a Warzone has concluded that the programme was "significantly deceptive".
The chief executive of the broadcaster had already issued an apology, stating there had been "a major oversight in relation to factual correctness".
Ofcom has instructed the broadcaster to transmit a prime-time announcement about its conclusions.
"As this represents a major infringement of our code, we are instructing the corporation to transmit a statement of our conclusions against it on BBC Two at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Potential to Undermine Credibility'
The regulator's announcement said: "Our probe determined that the film's lack of disclosure that the voice's parent held a role in the Hamas-administered government was significantly deceptive.
"Consequently that the audience did not have vital facts which may have been very significant to their assessment of the narrator and the content he presented.
"Confidence is at the heart of the relationship between a media organization and its viewers, especially for a national broadcasting corporation such as the public broadcaster.
"This oversight had the risk to erode the significantly high levels of confidence that audiences would have invested in a BBC factual programme about the conflict in Gaza."
The programme was pulled from the online platform in last February after the presenter's family links were revealed, and in this past July an broadcaster's internal assessment found it breached the broadcaster's journalistic standards on factual correctness.
A BBC spokesperson commented: "The Ofcom ruling is in line with the results of Peter Johnston's review, that there was a significant failing in the film in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will follow the sanction as soon as the schedule and language are determined."
