Iranian protesters have attacked a religious school in Karaj province near Tehran, the conservative Fars news agency reported Saturday.
Iran saw another day of large pro-regime rallies on Thursday after authorities declared the end of deadly unrest.
The Russian Ministry of Foreign Affairs said on Monday that interference from abroad in the situation in Iran is unacceptable.
Iran warned of a tough crackdown on Sunday against demonstrators posing one of the boldest challenges to its clerical leaders since nationwide unrest shook the Islamist theocracy in 2009.
Some 200 protesters marched through central Tehran Sunday as authorities braced for a possible fourth night of unrest and cut access to social media.