Opposition leader Mousavi's nephew 'among the fatalities' as Tehran and other cities erupt in protest and violence on holy day

This article is more than 10 years old

This article is more than 10 years old

The nephew of Iran's reformist opposition leader, Mir Hossein Mousavi, was reported to be among at least nine people killed after the streets of Tehran and other cities erupted in violent clashes between security forces and protesters.

Ali Mousavi, 35 and a father of two, was reportedly shot through the heart after police opened fire during disturbances in Tehran's Enghelab Square.

The authorities tonight tried to assert control over Tehran by reportedly declaring a 7pm curfew and outlawing all gatherings of more than three people, a source inside the capital told the Guardian.

The move followed announcements by opposition supporters of plans to meet in some of the city's main squares and parks to mark Sham-e Ghariban, which is part of the Ashura ceremonies.

News of Mousavi's nephew's death, reported by the reformist website Parlemannews, was certain to send shock waves through Iran's opposition Green Movement.

There were reports of at least four other fatalities in Tehran and four more in Tabriz as tens of thousands of demonstrators gathered for the Shia Ashura ceremonies and to voice anger against the government.

Parlemannews reported that Mousavi had gone to Ebn-e Sina Hospital, where the body of his nephew had been taken. He was accompanied by the dead man's parents and fellow reformist politicians.

Rah-e Sabz, another reformist website, reported large crowds of people moving towards Ebn-e Sina Hospital in a show of solidarity with Mousavi after the death.

Rah-e Sabz also reported at least four other people were killed in the capital, including an elderly man who was shot through the forehead at a crossroads in Tehran city centre. Two others were said to have been shot nearby at Kalej bridge, in Enghelab Street. Rah-e Sabz, citing witnesses, said crowds held up the elderly man and started chanting slogans against Iran's supreme leader, Ayatollah Ali Khamenei.

Another person was reportedly killed after being beaten on the head with a baton, according to Rah-e Sabz.

Meanwhile, Rouydad News, another opposition site, reported that four people were killed in the northern city of Tabriz.

Crowds prevented security forces from taking away those wounded in the Tehran shootings. According to other eyewitness reports, members of the hardline Basij militia attacked demonstrators with daggers and knives.

Disturbances were also reported in Isfahan, Shiraz, Masshad, Arak and Najafabad, where the Rah-e Sabz described the situation as "severe".

Najafabad, birthplace of the dissident Grand Ayatollah Hossein Ali Montazeri, who died last Sunday, has witnessed several outbreaks of unrest in the past week.

Today's religious ceremonies – marking the 7th-century death of the Prophet Muhammad's grandson, Imam Hossein – coincides with the ritual seven-day mourning ceremonies for Montazeri, who had repeatedly criticised the government and denounced President Mahmoud Ahmadinejad's re-election last summer as invalid.

Ashura ceremonies commonly feature vast crowds of people marching and beating their chests in memory of Imam Hossein, who is seen as a martyr against oppressive government. This year the opposition pledged to use the holy day to voice continued opposition to the government.

The authorities responded by warning of a huge crackdown. Hospitals and emergency services were put on alert to expect large-scale casualties.

The authorities are taking a risk in using lethal force against protesters during the Islamic month of Moharram, during which war and bloodshed is deemed to be religiously haram, or forbidden. It raises the likelihood of a series of mourning cycles, as required by Shia tradition. It was such a mourning cycle that fatally undermined the Shah's regime when it tried to suppress demonstrations in 1978.