Iranian students clashed with security forces outside a university in Tehran for the second day in a row, in what was seen as the largest show of opposition in the capital since a deadly clash last month, according to footage posted online.
The latest protest broke out on Sunday in front of the Amir Kabir University of Technology, when students confronted members of the Basij, a volunteer paramilitary formation that has played a prominent role in suppressing earlier anti-government protests.
According to videos posted on social media, students could be heard chanting anti-government slogans. Some of the videos also showed protesters waving the Iranian flag.
Similar rallies have previously been recorded at at least five other universities across the country, including Tehran's Sharif University.
Tehran's universities have often been the scene of student protests since the 1979 revolution, which have ended in clashes with security forces.
The demonstrations coincided with hundreds of commemorations held across the country this week to remember victims killed in major clashes with security forces in January.
According to human rights organizations, at least 7.000 people have been killed in nationwide protests that erupted in late December, although the actual death toll is believed to be significantly higher.
Most of the killings allegedly occurred between January 8 and 10, at the height of the repression.
The protests, which have since calmed down, were among the largest in Iran since the 1979 Islamic Revolution.
Historically, commemorations in Iran have often taken on political significance during periods of unrest.
The protests have attracted global attention and condemnation of the repression by government forces.
Amnesty International said at least 30 Iranians face the death penalty in connection with the protests.
US President Donald Trump warned Tehran to refrain from further violence against protesters and threatened military action against the regime.
Trump has sent two aircraft carrier strike groups to the region, with dozens of fighter jets and bombers, and other military aircraft and support forces have been spotted arriving at air bases in the Middle East.
The Trump administration is also pressuring Iran to agree to limits on its nuclear program, which Tehran says is intended for peaceful, civilian purposes, such as generating electricity.
Washington, along with Israel, accuses Tehran of intending to develop nuclear weapons.
In a speech broadcast live on state television, Iranian President Masoud Peskov said his country would not bow to pressure from world powers.
"World powers are lining up to force us to bow our heads... but we will not bow our heads despite all the problems they are creating for us," he said.
US and Israeli forces have bombed several Iranian facilities believed to contain key components of the nuclear infrastructure.
However, it is unclear to what extent the attacks have set back these programs.
Trump said he was considering a limited military strike.
"I guess I can say I'm considering it," he said at the White House on February 20.
Serbia and Sweden are among the latest countries to urge their citizens to leave Iran amid a major buildup of US forces in the region.
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