The BBC committed a "serious breach" of media regulations by not revealing that the narrator of a programme about the Gaza conflict was the child of a Hamas official, according to British broadcasting authority Ofcom.
An probe by the media regulator into Gaza: How to Survive a Warzone has found that the documentary was "significantly deceptive".
The BBC's director general had earlier expressed regret, saying there had been "a significant failing in relation to truthfulness".
The authority has directed the BBC to air a peak-time declaration about its decisions.
"Since this amounts to a significant violation of our rules, we are ordering the broadcaster to transmit a statement of our determinations against it on BBC Two at nine o'clock in the evening, with a timing to be finalised," the statement read.
'Risk to Erode Credibility'
The regulator's report declared: "Our investigation determined that the programme's failure to disclose that the narrator's parent held a post in the Hamas-administered administration was significantly deceptive.
"This implied that the audience did not have critical information which may have been very significant to their assessment of the narrator and the details he shared.
"Confidence is at the core of the bond between a broadcaster and its public, especially for a national broadcasting corporation such as the BBC.
"This oversight had the potential to damage the significantly high degrees of trust that audiences would have invested in a BBC factual programme about the Gaza conflict."
The programme was withdrawn from iPlayer in February after the presenter's familial connections were revealed, and in this past July an corporation's own inquiry found it infringed the organization's editorial guidelines on factual correctness.
A corporation official commented: "The authority's determination is in accordance with the results of the internal assessment, that there was a significant failing in the documentary in relation to the corporation's content standards on factual correctness, which corresponds to Rule 2.2 of the regulator's media standards.
"We issued an apology for this and we agree with Ofcom's decision in full. We will adhere to the sanction as soon as the date and wording are determined."
