An Iranian reformist Web site said that the nephew of Iran’s opposition leader and defeated presidential candidate Mirhossein Mousavi was killed Sunday during clashes between anti-government protesters and security forces in Tehran.

Parlemannews, a website run by the Iranian parliament’s minority reformist faction, said, “Ali Mousavi was shot near his heart today at noon and died later in a Tehran hospital.”

Opposition Web sites said earlier that four protesters were killed during Sunday’s unrest, but Tehran Police Chief Brigadier General Azizollah Rajabzadeh rejected the reports, saying “so far no one has been killed,” according to Iran’s ISNA news agency.

As millions of Iranians held rallies on Sunday across the country to commemorate the Shiite Muslim ritual of Ashura, sporadic clashes were seen in some parts of downtown Tehran.

Large crowds of people gathered in every major Iranian cities to commemorate Ashura, state television footage showed. The commemoration marks the death of Imam Hussein, grandson of Prophet Mohammed, who was killed and buried in Karbala in 680 AD.

(article source: Xinhua, photo source: The Guardian)