The BBC committed a "serious breach" of broadcasting rules by failing to disclose that the presenter of a documentary about Gaza was the offspring of a Hamas official, as ruled by British broadcasting authority Ofcom.
An inquiry by the broadcasting watchdog into Gaza: How to Survive a Warzone has concluded that the documentary was "materially misleading".
The head of the BBC had earlier expressed regret, stating there had been "a serious error in relation to accuracy".
Ofcom has instructed the corporation to air a evening announcement about its conclusions.
"Given this constitutes a serious breach of our regulations, we are instructing the broadcaster to air a announcement of our conclusions against it on the BBC's second channel at 21:00, with a timing to be confirmed," the statement read.
'Potential to Undermine Trust'
The watchdog's report declared: "The inquiry we conducted found that the documentary's failure to disclose that the presenter's father served in a post in the Hamas-administered administration was significantly deceptive.
"It meant that the audience did not have vital facts which may have been very significant to their judgment of the presenter and the information he shared.
"Credibility is at the heart of the relationship between a broadcaster and its viewers, especially for a state-funded media outlet such as the BBC.
"This failing had the risk to damage the very considerable levels of trust that the public would have put in a documentary produced by the BBC about the Gaza conflict."
The programme was removed from the online platform in February after the presenter's personal associations were revealed, and in July an broadcaster's internal assessment concluded it breached the organization's journalistic standards on truthfulness.
A corporation official stated: "The Ofcom ruling is in accordance with the results of the internal assessment, that there was a significant failing in the film in relation to the BBC's Editorial Guidelines on factual correctness, which reflects regulation 2.2 of the authority's broadcasting regulations.
"We expressed regret for this and we accept Ofcom's decision in its entirety. We will adhere to the penalty as soon as the date and language are finalised."
