"Iran's state broadcaster was hacked on air on Saturday", he says the BBC, “hackers they stopped the newscast as a protest against the country's leader".
Although such incidents are "historically rare", they add to the more recent ones, and show there is a "wide open disagreement".
The hack came after at least three people were shot when protesters clashed with security forces in fresh unrest over the death of Mahsa Amini.
Amini was arrested in Tehran by the morality police for allegedly not covering her hair properly. The 22-year-old Kurdish-Iranian died in the hands of the authorities on September 16, three days after her arrest. Her death has sparked an unprecedented wave of protest across the country.
Saturday's 21:00 (17:30 GMT) television newscast was interrupted by images that included Iran's supreme leader with a target on his head, photos of Amini and three other women killed in the recent protests. Captions read "join us and stand up", while another said "the blood of our youth drips from your feet".
The interruption lasted only a short time seconds before the state broadcaster came back on.
