Tehran said 21 people had died in clashes across the country as thousands of people took to the streets. Police have arrested hundreds of demonstrators.
"We regret the reported loss of life and hope further violence will be avoided. We expect that the rights to peaceful assembly and expression of the Iranian people will be respected," Guterres spokesman Farhan Aziz Haq said on behalf of the secretary-general.
Iran's Supreme leader Ayatollah Ali Khamenei had blamed the country's "enemies" earlier today for almost six days of deadly unrest that have shaken the conservative country.
A fifth night of unrest Monday to Tuesday saw six protesters killed during an attack on a police station in Qahderijan in the central province of Isfahan, state TV said, bringing the death toll to 21.
Disclaimer: No Business Standard Journalist was involved in creation of this content
