Widening demonstrations sparked by Iran’s ailing economy spread Thursday into the Islamic Republic’s rural provinces, with at least seven people being killed in the first fatalities reported among security forces and protesters, authorities said. The deaths may mark the start of a heavier-handed response by Iran’s theocracy over the demonstrations, which have slowed in the capital, Tehran, but expanded elsewhere. The fatalities, two on Wednesday and five on Thursday, occurred in four cities, largely home to Iran’s Lur ethnic group. The protests have become the biggest in Iran since 2022, when the death of 22-year-old Mahsa Amini in police custody...