(CNN) The University of Tehran is working to track and secure the release of its students who were arrested for taking part in recent anti-government protests in Iran, according to the semiofficial Iranian Students' News Agency.

"A committee has been established to follow up on and track Tehran University's detained students' situation Our aim is to work with relevant authorities and facilitate the quickest release and return of those students to their studies and family embrace," Majid Sarsanghi, the University of Tehran's deputy chancellor for cultural affairs, is quoted by the news agency.

It's not clear how many students have been arrested in connection with the protests, which broke out more than a week ago. At least 21 people were killed, many in clashes with security forces trying to quell the rallies.

Authorities in Iran have said 450 people have been detained. The US State Department has put the number held at 1,000. Tehran public prosecutor Abbas Jafari Dolatabadi said Sunday that about 70 defendants had been released on bail in the last 48 hours, according to the state-run Islamic Republic News Agency.

Reformist Iranian lawmaker Mahmood Sadeqi told the semiofficial Iranian Labor News Agency that he holds details on detained students. But he said he does not know the whereabouts of 10 of the 90 who he believes were detained from across the country.

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