TEHRAN — Anti-regime protests continued for a fourth day on Tuesday at Iran’s major universities, signaling that the unrest that shook the country in January has only been paused, not extinguished.

Since campuses reopened after weeks of closure, students at such leading universities as Sharif, Amirkabir, Tehran, Shahid Beheshti, Alzahra and Khajeh Nasir Toosi, among others, have staged daily gatherings. Videos circulating online show demonstrators chanting "woman, life, freedom," "death to the entire regime," and "this is the last battle. Pahlavi will return." In several instances, protesters burned the Islamic Republic flag and waved the pre-1979 secular lion-and-sun flag.

When the protests first erupted in late December, grievances centered on the faltering economy and overuse of state violence. But on campuses this week, chants have focused more explicitly on calls for the downfall of Supreme Leader Ali Khamenei and the Islamic Republic itself.

Clashes have broken out at several universities between anti-government students and pro-regime Basij-aligned students, who are affiliated with the Revolutionary Guard. Footage posted online from Shahid Beheshti University on Tuesday showed confrontations near the economics building, with some students claiming that Basij members were brought in from outside and that campus security did nothing to stop them. At Sharif University, students reportedly became trapped inside the campus after gates were closed during scuffles.