The BBC on Tuesday urged United Nations experts to condemn the "ongoing targeting and harassment" of some of its Persian language journalists after Tehran convicted some for "propaganda" against the state.
According to the broadcaster, documents published in February by a hacking group appear to reveal that several current and former BBC News Persian journalists were convicted in absentia by an Iranian court in February 2022 for "propaganda against the Islamic Republic".
A complaint was submitted by lawyers on behalf of the BBC to five special rapporteurs, it said in a statement.
The rapporteurs are independent experts in areas such as freedom of expression and human rights and summary or arbitrary executions, who do not speak for the UN but report their findings to it.
"Recent developments have amplified the severe situation facing our BBC News Persian staff daily. They are being penalized for their journalism and professionalism," said BBC World Service director Liliane Landor.
"We are urging UN experts to robustly condemn the Iranian authorities' harassment and to hold the regime to account," she added.
Lawyers Caoilfhionn Gallagher and Jennifer Robinson, who is acting for the BBC, accused Iran of abusing "national security and counter-terrorism laws against the BBC".
They said, "Convictions in absentia for BBC News Persian journalists for 'propaganda' against the state for their independent reporting on Iran are designed to intimidate and silence the BBC's journalism about Iran".
"We call on the UN to denounce these unlawful actions in the strongest possible terms," the pair added.
The BBC said the "targeting and intimidation" of staff had "escalated dramatically" since September 2022 following mass protests in Iran.
The appeal follows an earlier joint statement by four UN experts in 2020 in which they voiced their "alarm" at the treatment of BBC journalists and their families.
Last month, Pouria Zeraati, a UK-based presenter for Persian-language Iran International, sustained injuries to his leg after being stabbed by two assailants outside his London home.
Counter-terrorism detectives are probing the assault and say his attackers went straight to Heathrow Airport and left the country within hours.
A 2024 survey of BBC News Persian staff found half of the respondents said they had received online threats or been harassed online for working for the BBC.