Some residents of Tehran on Tuesday chanted slogans against supreme leader Ali Khamenei on the eve of the most significant annual commemoration of the 1979 Iranian revolution, according to footage posted on social media.
Iran was rocked by protests last month opposing, which were put down by what activists condemned as an unprecedented crackdown by the authorities, with thousands shot dead by security forces.
There had been few reports of significant protest activity over the last fortnight in the face of the crackdown until now.
But late Tuesday people took to balconies to chant slogans including "death to Khamenei", "death to the dictator" and "death to Islamic republic", according to footage shared by widely followed protest monitor channels on Telegram and X, including Vahid Online and Mamlekate.
It was not immediately possible for AFP to verify the videos.
The chants came as authorities set off fireworks to mark the eve of Wednesday's date of Bahman 22, which celebrates the anniversary of the resignation of the ousted shah's last prime minister and the formal assumption of power by revolutionary leader Ruhollah Khomeini.
Vahid Online posted one video taken from the top floor of a residential area of loud anti-government chants echoing around the buildings. Mamlekate also posted videos, apparently shot in the hilly parts of northern Tehran, with the chants resounding around the area.
The social media channel Sharak Ekbatan, which follows the Tehran residential district of Ekbatan, said the authorities had sent in security forces to shout "God is greatest" after residents started chanting slogans against the government.
According to Iranian news site IranWire, there were similar reports of chants in cities including the central city of Isfahan and Shiraz in the south.
According to the US-based group Human Rights Activists News Agency (HRANA), 6,984 people, including 6,490 protesters, were killed during the protests as authorities used live fire against demonstrators.
Meanwhile, at least 52,623 people have been arrested in the ensuing crackdown, it added.
