Trump threatens U.S. intervention if Iran violently suppresses ongoing protests, escalating tensions after last year's 12-day war between Israel and Iran.

U.S. sanctions on Iran have taken a heavy toll on the country’s economy, contributing to the current protest movement.

Both the semi-official Fars news agency and human rights group, Hengaw, said two people had died during clashes between protesters and security forces in the city of Lordegan, in south-western Iran. Three more people were killed in Azna and another in Kouhdasht, Fars reported, all in the west of the country.