The BBC was found to have committed a "significant breach" of broadcasting rules by not revealing that the presenter of a film about the Gaza conflict was the child of a Hamas official, according to British broadcasting authority Ofcom.
An investigation by the media regulator into Gaza: How to Survive a Warzone has determined that the film was "significantly deceptive".
The BBC's director general had already issued an apology, noting there had been "a serious error in relation to accuracy".
The regulator has directed the broadcaster to broadcast a evening statement about its decisions.
"Given this constitutes a serious breach of our regulations, we are ordering the broadcaster to air a message of our conclusions against it on BBC Two at 9pm, with a timing to be finalised," it said.
'Potential to Undermine Credibility'
The watchdog's announcement said: "Our investigation concluded that the documentary's failure to disclose that the narrator's father served in a position in the Hamas-run government was materially misleading.
"This implied that the public did not have vital facts which may have been very significant to their assessment of the presenter and the information he presented.
"Confidence is at the core of the connection between a media organization and its audience, especially for a state-funded media outlet such as the BBC.
"This error had the possibility to damage the exceptionally strong amounts of credibility that viewers would have put in a documentary produced by the BBC about the Israel-Gaza war."
The film was pulled from the BBC's streaming service in February after the boy's family links were revealed, and in this past July an internal BBC review concluded it infringed the corporation's journalistic standards on factual correctness.
A BBC spokesperson said: "The Ofcom ruling is in accordance with the conclusions of the corporation's inquiry, that there was a major oversight in the programme in relation to the BBC's Editorial Guidelines on accuracy, which corresponds to clause 2.2 of Ofcom's Broadcasting Code.
"We have apologised for this and we comply with the authority's determination in complete. We will adhere to the penalty as soon as the date and language are confirmed."
