"Iran's regime has shut down the internet to be able to kill and oppress in silence," Finland's Minister of Foreign Affairs Elina Valtonen wrote on X.
"This will not be tolerated. We stand with the people of Iran - women and men alike", she said, adding that she would "summon the Iranian ambassador this morning."
Valtonen also said the Nordic country was also "exploring measures to help restore freedom to the Iranian people" together with the EU.
Norway-based NGO Iran Human Rights (IHR) said Monday that the violent crackdown on a wave of protests in Iran has killed at least 648 people.
A nationwide shutdown of the internet by authorities in Iran, which activists fear is aimed at masking the scale of a crackdown, has now lasted over 108 hours, a monitor said on Tuesday.
