Iran's powerful Revolutionary Guards called on the Islamic Republic's judiciary on Thursday to prosecute "those who spread false news and rumours" about a young woman whose death in police custody has triggered nationwide protests.
Protesters in Tehran and other Iranian cities torched police stations and vehicles earlier on Thursday as public outrage over the death showed no signs of easing, with reports of security forces coming under attack.
Mahsa Amini, 22, died last week after being arrested in Tehran for wearing "unsuitable attire". She fell into a coma while in detention. The authorities have said they would launch an investigation into the cause of her death.
In a statement, the Guards expressed sympathy with the family and relatives of Amini.
"We have requested the judiciary to identify those who spread false news and rumours on social media as well as on the street and who endanger the psychological safety of society and to deal with them decisively," the Guards, who have cracked down on protests in the past, said.
Pro-government protests are planned for Friday, Iranian media said.
"The will of the Iranian people is this: do not spare the criminals," said an editorial in the influential hardline Kayhan newspaper.
The protests over Amini's death are the biggest in the Islamic Republic since 2019. Most have been concentrated in Iran's Kurdish-populated northwest but have spread to the capital and at least 50 cities and towns nationwide, with police using force to disperse protesters.
A member of an Iranian pro-government paramilitary organisation, the Basij, was stabbed to death in the northeastern city of Mashhad on Wednesday, two semi-official Iranian news agencies reported on Thursday.
The Tasnim and Fars news agencies reports of the stabbing appeared on Telegram as both their websites were not functioning on Thursday. There was no official confirmation of the death.
Tasnim also said another member of the Basij was killed on Wednesday in the city of Qazvin as a result of a gunshot wound inflicted by "rioters and gangs", bringing the total reported number of security force members killed in the unrest to four.
In the northeast, protesters shouted "We will die, we will die but we'll get Iran back" near a police station which was set on fire, a video posted on Twitter account 1500tasvir showed. The account focuses on protests in Iran and has around 100,000 followers.
Reuters could not verify the footage.
Another police station was set ablaze in Tehran as the unrest spread from Kurdistan, the home province of Amini and where she was buried on Saturday.
Amini's death has reignited anger over issues including restrictions on personal freedoms in Iran - including strict dress codes for women - and an economy reeling from sanctions.
Iran's clerical rulers fear a revival of the 2019 protests that erupted over gasoline price rises, the bloodiest in the Islamic Republic's history. Reuters reported 1,500 were killed.
Protesters this week also expressed anger at Supreme Leader Ayatollah Ali Khamenei. "Mojtaba, may you die and not become Supreme Leader," a crowd was seen chanting in Tehran, referring to Khamenei's son, who some believe could succeed his father at the top of Iran's political establishment.
Reuters could not verify the video.
Reports by Kurdish rights group Hengaw, which Reuters could not verify, said the death toll in Kurdish areas had climbed to 15. Iranian officials have denied that security forces have killed protesters, suggesting they may have been shot by armed dissidents.
With no sign of the protests easing, authorities restricted access to the internet, according to accounts from Hengaw, residents, and internet shutdown observatory NetBlocks.
Women have played a prominent role in the protests, waving and burning their veils, with some cutting their hair in public.
In northern Iran, crowds armed with batons and rocks attacked two members of the security forces on a motorbike as a crowd cheered, as seen on a video, which Reuters was unable to verify.