Iranian opposition sources say government forces have clashed with anti-government demonstrators who gathered in the Iranian capital during a Shi’ite Muslim holiday.

Witnesses say some of the demonstrators have been beaten or arrested, and that riot police smashed the windows of passing cars.

Ashura ceremonies culminate Sunday.

During Ashura, Shi’ite worshipers mourn the seventh-century killing of Imam Hussein, the grandson of the Prophet Muhammad.

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