More than 1,000 students, most of whom attend Tehran University, are among those who have been detained since protesters erupted across several cities in Iran.
A report by the Iranian Students' News Agency quoted Mahmoud Sadeghi, a reformist member of parliament, as saying that “many of them were not involved in protests”.
At least 21 people have been killed in the ongoing protests, which erupted across the country 10 days ago against the regime.
Protests in Iran have resumed for the tenth day in a row, with demonstrations in several cities taking place throughout Saturday night.
On Saturday evening, protesters staged a demonstration in the town of Mahshahr, south of the province of Ahwaz, as well as the in the Johardasht area in the city of Karaj, north of Tehran.
A video circulated by activists across social media showed demonstrators shouting to their countrymen to join them.
In Shushtar, north of Ahwaz province, young men and women took to the main streets of the city while police and security forces attempted to disperse the protesters.
In Tehran, Iranian activists said the riot police violently broke up a sit-in demonstration at the intersection of Muniriya Street and Javed Street by the families of detainees demanding the release of their relatives arrested during recent demonstrations.
Iranian Turks, also known as Azerbaijani Turks, also clashed with a military unit in the northern city of Tabriz on the first day of joining the protests which have been ongoing for the past 10 days.