Iran's state-run broadcaster was apparently hacked on air Saturday, with a news bulletin interrupted by a protest against the country's leader, APA reports citing BBC.
A mask appeared on the screen, followed by an image of Supreme Leader Ali Khamenei with flames around him.
The group called itself "Adalat Ali", or Ali's Justice.
It comes after at least three people were shot dead when protesters clashed with security forces in new unrest over the death of Mahsa Amini.
Saturday's TV news bulletin was interrupted at about 18:00 local time with images which included Iran's supreme leader with a target on his head, photos of Ms Amini and three other women killed in recent protests.
One of the captions read "join us and rise up", whilst another said "our youths' blood is dripping off your paws".
The interruption lasted only a few seconds before being cut off.