The BBC was found to have committed a "major breach" of broadcasting rules by failing to disclose that the voice of a programme about the Gaza conflict was the offspring of a Hamas representative, as determined by UK media regulator Ofcom.
An inquiry by the media regulator into the documentary titled Gaza: How to Survive a Warzone has determined that the programme was "significantly deceptive".
The BBC's director general had previously apologised, noting there had been "a significant failing in relation to truthfulness".
The authority has instructed the broadcaster to broadcast a prime-time announcement about its findings.
"As this represents a significant violation of our regulations, we are instructing the corporation to broadcast a announcement of our determinations against it on BBC2 at nine o'clock in the evening, with a schedule to be confirmed," it said.
'Potential to Undermine Credibility'
The watchdog's statement declared: "Our probe determined that the documentary's failure to disclose that the voice's male guardian held a position in the Hamas-administered authority was materially misleading.
"It meant that the public did not have vital facts which may have been very significant to their judgment of the presenter and the information he provided.
"Credibility is at the core of the connection between a broadcaster and its viewers, especially for a state-funded media outlet such as the BBC.
"This failing had the potential to undermine the very considerable degrees of credibility that the public would have invested in a factual film from the broadcaster about the conflict in Gaza."
The programme was pulled from the online platform in February after the presenter's family links were revealed, and in July an broadcaster's internal assessment found it violated the organization's journalistic standards on factual correctness.
A BBC spokesperson stated: "The authority's determination is in accordance with the findings of the internal assessment, that there was a significant failing in the documentary in relation to the BBC's Editorial Guidelines on truthfulness, which aligns with clause 2.2 of the authority's broadcasting regulations.
"We have apologised for this and we comply with Ofcom's decision in full. We will comply with the penalty as soon as the timing and wording are finalised."
