Several people were killed during unrest in Iran overnight into Thursday, Iranian media and rights ‍groups reported, as the biggest protests to hit the country for three years over soaring inflation sparked violence in several regions.

The semi-official Fars news agency and rights group Hengaw reported deaths in Lordegan, a city in western Iran. Authorities confirmed one death in the western city of Kuhdasht, and Hengaw reported another death in the central province of Isfahan.

The clashes between protesters and security services mark a significant escalation in the unrest ⁠that has spread since shopkeepers began protesting on Sunday over the government’s handling of a currency slide and rapidly rising prices.

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Fars reported that two people had been killed in Lordegan in clashes between security services and what it called armed protesters. It earlier said several had died. Hengaw said several people had been killed and wounded there by security forces.