In Iran, the BBC has verified footage of demonstrators marching on the campus of the Sharif University of Technology in the capital Tehran on Saturday. They were later seen scuffling with government supporters.
Protests were also reported at other universities in Tehran and elsewhere.
Iranian media reported demonstrations also took place on Sunday at the Iran University of Science and Technology and Khajeh Nasir Toosi University in Tehran, and at Ferdowsi University of Mashhad in north-eastern Iran.
In one video the BBC has verified, anti-government protesters raise the Lion and Sun flag – a symbol of Iran before the 1979 Islamic Revolution – at the Sharif University. People in the crowd chant “Javid Shah” (“long live the king”).
Another verified video shows a pro-government crowd holding a counter-protest at the Sharif University in which US and Israeli flags are being burned.
Clashes between pro and anti-government crowds are also seen in verified footage filmed at Amirkabir University of Technology.
Students from different universities have been gathering to honour thousands of those killed by authorities last month.
The US-based Human Rights Activists News Agency (Hrana) said it had confirmed the killing of at least 7,015 people during that wave, including 6,508 protesters, 226 children and 214 people affiliated with the government. The latest figures were updated on 15 February.
Hrana also said it was investigating 11,744 more reported deaths.
Iranian authorities said late last month that more than 3,100 people had been killed – but that the majority were security personnel or bystanders attacked by “rioters”.
President Trump has supported protesters in the past – at one stage appearing to encourage them with a promise that “help is on its way”.
Additional reporting by BBC Verify’s Emma Pengelly