Dozens of Iranians gathered Sunday outside the French embassy in Tehran protesting against cartoons of the supreme leader Ali Khamenei by French satirical weekly Charlie Hebdo. The magazine on Wednesday published caricatures of Khamenei in support of the months-long protests in Iran, sparked by the death in custody of Mahsa Amini, following her arrest for allegedly violating the country's strict dress code. Dozens of protesters, most of them religious seminary students, gathered in front of the embassy in the center of the capital Tehran and set fire to French flags, AFP journalists reported. Waving Iranian flags, they held pictures of Khamenei and signs reading "I will sacrifice my life for the leader", and "Shame on Charlie Hebdo". "I came to support my revolution, my leader", 17-year-old seminary student Karim Heydarpour said. Iran's foreign ministry spokesman Nasser Kanani on Sunday said that freedom of speech should not be used as a pretext for "insulting" religion. Paris should observe the "fundamental principles of international relations -- namely mutual respect (and) non-interference in the internal affairs of others", he said. On Thursday, Iran said it was closing the Tehran-based French Institute for Research in Iran "as a first step" in response to the cartoons. Located in the center of Tehran, IFRI had been closed for many years, but was reopened under the 2013-2021 presidency of the moderate president Hassan Rouhani as a sign of warming bilateral relations.