BBC:

Caroline Hawley and Alys Davies

A member of Iran's security forces was killed during a fourth day of protests in the country, which have been sparked by a currency collapse, officials have said.

Citing regional chief justice Saeed Shahvari, Iran's judiciary-affiliated Mizan news agency said Amir Hessam Khodayari Fard was killed in the city of Kouhdasht, in the western Lorestan province, on Thursday.

A number of members of the security forces were also injured, state media reported.

Footage verified by BBC Persian appears to show security forces firing at protesters in the city on the same day.

Confrontations were also reported in the southern province of Fars and the western provinces of Hamedan and Lorestan on Thursday.

The authorities in the capital, Tehran, had declared Wednesday a bank holiday - in an apparent effort to quell the unrest, which started in the capital on Sunday.

The semi-official Fars news agency reported that a 21-year-old member of the Basij - a paramilitary force linked to Iran's Revolutionary Guards (IRGC) - was killed during a confrontation in the city of Kouhdasht.

Thirteen police officers and Basij members had been injured by stone throwing, the report said.

Twenty protesters were arrested in the city on Thursday night, the IRGC-affiliated Tasnim news agency said.

Unrest broke out in other cities too.

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