Thousands of Iranians have protested in the nation's south-east to mark a September crackdown by security forces known as "Bloody Friday".
It came as Iran's clerical rules battled persistent nationwide unrest.
Amnesty International said security forces unlawfully killed at least 66 people on September 30 after firing at protesters in Zahedan, capital of flashpoint Sistan-Baluchistan province.
Authorities said dissidents had provoked the clashes.
A video posted by the widely followed 1500Tasvir activist Twitter account purported to show thousands marching again in Zahedan on Friday.
Reuters could not verify the authenticity of the footage.
Another video which 1500Tasvir said was from the town of Khash in the south-east showed protesters trampling and breaking a street sign carrying the name of top general Qassem Soleimani, who was assassinated in a US drone attack in 2020 in Iraq.
The unrest in the lead-up to the September 30 incident was fuelled by allegations of the rape of a local teenage girl by a police officer. Authorities have said the case is being investigated.
Anti-government demonstrations also started erupting that month after the death of a Kurdish woman, Mahsa Amini, who had been detained by morality police for allegedly flouting the Islamic Republic's strict dress code imposed on women.
Nationwide demonstrations have since turned into a popular revolt, with people ranging from students to doctors, lawyers, workers and athletes taking part, with fury directed mostly at Supreme Leader Ayatollah Ali Khamenei.
A group of countries led by Germany and Iceland requested a debate on the "deteriorating" situation in Iran at the top UN human rights body later this month, a document showed.
Iranian archer joins athletes' support for protests
Footage has emerged of archer Parmida Ghasemi expressing support for the protests by removing her hijab during an awards ceremony in Tehran.
Reuters could not verify the authenticity of videos.
In the video, Ghasemi, standing with other athletes on a podium, lets her headscarf fall as unseen people in the audience clap and shout "bravo".
The athlete standing next to her tries to pull up her scarf, but she moves away her head.
She is not the first Iranian athlete to express solidarity with the demonstrations, which pose one of the biggest challenges to Iran's clerical rulers since the 1979 Islamic Revolution.
Video clips that purportedly show Iran's water polo team failing to sing the national anthem at a competition in Thailand have also appeared on social media.
Iran's deputy sports minister, Maryam Kazemipour, said on Wednesday some female Iranian athletes have acted against Islamic norms and then apologised for their actions, the state news agency reported.
National beach soccer players refused to sing Iran's anthem at the beginning of a match against the United Arab Emirates in Dubai, according to 1500Tasvir.
Then the players did not cheer or celebrate after defeating Brazil to win the championship, the account said.