The BBC was found to have committed a "major breach" of broadcasting rules by omitting to mention that the narrator of a documentary about the Gaza conflict was the son of a Hamas administrator, according to regulatory body Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the programme was "substantially inaccurate".
The BBC's director general had previously apologised, stating there had been "a serious error in relation to factual correctness".
The authority has directed the BBC to air a evening declaration about its conclusions.
"Given this constitutes a serious breach of our rules, we are ordering the broadcaster to broadcast a statement of our findings against it on BBC2 at 9pm, with a schedule to be finalised," it said.
'Potential to Undermine Credibility'
The watchdog's report stated: "The inquiry we conducted found that the programme's omission to reveal that the narrator's father held a post in the Hamas-controlled administration was significantly deceptive.
"This implied that the viewers did not have essential details which may have been highly relevant to their evaluation of the narrator and the content he provided.
"Trust is at the center of the relationship between a media organization and its audience, particularly for a state-funded media outlet such as the BBC.
"This oversight had the potential to erode the significantly high levels of confidence that viewers would have put in a BBC factual programme about the Gaza conflict."
The documentary was pulled from the online platform in February after the presenter's familial connections emerged, and in July an internal BBC review found it violated the corporation's content policies on truthfulness.
A representative for the broadcaster commented: "The authority's determination is in agreement with the conclusions of the corporation's inquiry, that there was a major oversight in the film in relation to the broadcaster's journalistic policies on accuracy, which reflects clause 2.2 of the authority's broadcasting regulations.
"We issued an apology for this and we agree with Ofcom's decision in its entirety. We will adhere to the sanction as soon as the date and language are finalised."
