Two Iranian students who visited a visa extension centre at Kazan Federal University on Friday were arrested after being subjected to "inhumane and unprofessional beating" by the police, according to the IRNA state news agency, which cited a statement from Iran's consulate in the city.

Tehran decries 'violent arrests' and 'inhumane and unprofessional beating' of Iranian students in Russia

About 1,200 university students in Iran were admitted to hospital due to food poisoning a day before their anti-regime protest, leading many to suspect the role of the government.

Day before anti-regime agitation, 1,200 students in Iran get sick due to food poisoning, allege conspiracy

The demonstrating students reportedly carried photos of victims of Tuesday's crash at a square leading to the university, in a rare display of dissent at Tehran's Islamic Azad University.

Iran students in rare protest over deadly campus bus crash