The military said it would “confront the enemies’ various plots in order to ensure security and peace for the people who are being unjustly assaulted”.
Intelligence Minister Mahmoud Alavi also on Friday warned “seditionists” that their “dream of defeating religious values and the great achievements of the revolution will never be realised”, according to the AsrIran website.
Iran’s clerical rulers fear a revival of the protests that erupted in 2019 over gasoline price rises, the bloodiest in the Islamic Republic’s history. Reuters reported 1,500 people were killed.
In the latest unrest, protesters in Tehran and other cities torched police stations and vehicles as outrage over Amini’s death showed no signs of abating, with reports of security forces coming under attack.
Iranian media reported the arrest of 288 rioters on Thursday.
In Madrid, four topless activists from the Femen women’s movement protested on Friday in front of the Iranian embassy over Amini’s death, carrying signs reading “Women, Life, Liberty” and “Mahsa Amini was assassinated”.
The protest took place peacefully and there were no arrests.
In Athens, angry protesters demonstrating over Amini’s death tried to approach the Iranian embassy on Thursday before being forced back by police wielding shields. Demonstrators chanted slogans and held placards reading “Homophobia and sexism kill”.
Protests over Amini’s death were also held in Canada and the Netherlands on Thursday.