Iranian human rights groups have reported a higher toll.
read moreIranian authorities have accused armed Iranian Kurdish dissidents of igniting the unrest, particularly in the northwest where most of Iran's over 10 million Kurds live.
Early on Wednesday, a video showed protesters in Tehran chanting "Mullahs get lost!"
The U.N. High Commissioner for Human Rights has called on Iran's clerical rulers to "fully respect the rights to freedom of opinion, expression, peaceful assembly and association".
human rights office spokesperson Ravina Shamdasani said on Tuesday reports indicated "hundreds have also been arrested, including human rights defenders, lawyers, civil society activists and at least 18 journalists".