At least 538 protesters killed in Iran unrest as regime warns US and Israel against intervention

At least 538 people have been killed and over 10,600 detained in Iran's crackdown on nationwide protests, with activists warning the real toll may be higher due to an information blackout. Iranian authorities have threatened the US and Israel over any intervention, while the US considers possible responses and expresses support for protesters. Despite severe repression and internet shutdowns, protests continue in Tehran and Mashhad, with demonstrators using creative tactics to evade security forces.