The students had called for a march to Parliament House from the university campus to express their opposition to the legislation. "We are yet to ascertain the identities", Biswal said.
Many Jamia students were also detained by the police during the anti-CAB protest. "Media personal are a witness to these events", the student community of Jamia Milia Islamia said in a statement.
The Delhi Police said they had misjudged the scale of the protest - while they expected 100 to 200 demonstrators, thousands turned up.
Protests in Jamia Nagar turned violent as buses were torched and vandalized by Muslim mobs in the National Capital.More news: Mourinho backs Spurs for top-four Premier League finish
According to Saimon Farooqui, national secretary of Congress-affiliated National Students' Union of India, the protesters were peacefully sitting on Mathura Road when policemen tried to "trouble" a couple of protesters, who resisted. He said, "Our staff and students are being beaten up and forced to leave the campus".
As reports claimed that students Jamia Millia Islamia were part of the protest, a student group disassociated themselves from the violence saying that their protests have been "peaceful and non-violent". Meanwhile, Jamia Teachers' Association appealed to the students to keep away from such "direction-less" protest led by "local political leaders".
The university has already declared winter vacation and postponed semester examination after 13 December incident, it said, adding that a large number of students in the hostel have already left. Violence by certain elements is an attempt to vilify and discredit genuine protests. "AAP is a peaceful party that believes in democracy and non-violence". Kejriwal tweeted that no one should indulge in violence as it is completely unacceptable.
"AAP MLA is provoking people at the behest of Arvind Kejriwal. The sin of AAP is being exposed", he tweeted in Hindi. "I protested near Shaheen Bagh where nothing untoward happened", he told reporters.More news: Ryan Reynolds Finally Drops Deets on Baby No. 3 in Rare Interview
DMRC closed the entry and exit gates of Sukhdev Vihar Metro station on Sunday evening in view of the violence.
"Motorists coming from Badarpur side are advised to take Modi Mill Flyover from CRRI towards Nehru Place and those coming from Ashram Chowk side are advised to take Ring Road, Moolchand Flyover & BRT Corridor or DND Flyover", Delhi Traffic Police tweeted.
Violent protests have also rocked Northeast and West Bengal.More news: Red Wings dump Jets, end 12-game skid