Scale of violence and detentions

Iran’s leadership has vowed it will not back down in the face of growing nationwide protests over economic conditions. Thousands of people marched through the streets of Tehran calling for political reform and torching government buildings. The supreme leader, Ayatollah Ali Khamenei, has signalled that a greater crackdown is coming after the country plunged into an internet blackout. Lucy Hough speaks to the Guardian’s deputy head of international news Devika Bhat – watch on YouTube. Help support our independent journalism at theguardian.com/infocus