The British broadcaster committed a "serious breach" of media regulations by not revealing that the narrator of a programme about Gaza was the son of a Hamas representative, according to British broadcasting authority Ofcom.
An investigation by the broadcasting watchdog into the programme Gaza: How to Survive a Warzone has concluded that the documentary was "significantly deceptive".
The BBC's director general had already issued an apology, saying there had been "a significant failing in relation to accuracy".
Ofcom has ordered the BBC to broadcast a prime-time statement about its conclusions.
"As this represents a serious breach of our code, we are ordering the broadcaster to broadcast a announcement of our findings against it on the BBC's second channel at 21:00, with a date to be confirmed," it said.
'Risk to Undermine Credibility'
The authority's announcement said: "The inquiry we conducted concluded that the documentary's lack of disclosure that the narrator's father served in a post in the Hamas-controlled government was significantly deceptive.
"This implied that the public did not have critical information which may have been extremely pertinent to their evaluation of the voice and the information he provided.
"Credibility is at the core of the bond between a media organization and its viewers, particularly for a public service broadcaster such as the public broadcaster.
"This oversight had the possibility to damage the significantly high amounts of trust that audiences would have placed in a factual film from the broadcaster about the Gaza conflict."
The film was removed from the BBC's streaming service in last February after the presenter's family links came to light, and in July an corporation's own inquiry found it infringed the organization's content policies on accuracy.
A BBC spokesperson said: "The Ofcom ruling is in line with the results of the corporation's inquiry, that there was a major oversight in the programme in relation to the corporation's content standards on accuracy, which corresponds to clause 2.2 of the regulator's media standards.
"We expressed regret for this and we comply with Ofcom's decision in full. We will follow the directive as soon as the timing and language are finalised."
