Mass protests in Iran have now entered their fourth week posing the biggest challenge to the country's Islamic leaders in years.

Calls for the downfall of Supreme Leader Ayatollah Ali Khamenei are gathering pace and so too is the crackdown by state police, with human rights groups estimating at least 185 people have been killed, including children.

Protesters have hacked state TV and children taking part in the demonstrations inside their schools are being arrested.

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