United States President Donald Trump has imposed a 25-percent tariff on any country trading with Iran, escalating economic pressure as Iranian authorities crack down on widespread protests. Rights groups estimate at least 648 people have been killed in the unrest, with the true toll possibly much higher due to an ongoing internet blackout that hampers independent verification. Iranian officials claim to have regained control, staging mass pro-government rallies and declaring days of national mourning for security forces killed. International leaders have condemned the violence, while analysts caution that despite the scale of the protests, Iran's leadership retains significant repressive power.