Iran has seen one of the biggest nights of protests since anti-government demonstrations erupted six weeks ago.

Tens of thousands of people took to the streets in all major cities, as well as other places where demonstrations had recently subsided.

The escalation came after protesters marked 40 days since Kurdish Iranian woman Mahsa Amini died in police custody, sparking the unrest.

It is the most serious challenge to the Islamic republic since its inception.

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