Fatima Nafees, mother of Najeeb, was virtually dragged into a bus by police along with other students when they were on their way to India Gate, triggering criticism from Delhi Chief Minister Arvind Kejriwal who decided to visit the police station.
Fatima and her daughter Sadaf, were later released.
Earlier in the day, Kejriwal met President Pranab Mukherjee, and said he has been assured that the President will seek a report from the Home Ministry and the JNU administration on the issue.
The Chief Minister also submitted a memorandum to the President expressing concern over the "worrisome" situation prevailing in JNU.
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Najeeb (27), a student of School of Biotechnology and a native of Badaun in Uttar Pradesh, went missing on October 15 following an on-campus scuffle allegedly with the members of ABVP the night before.
Najeeb's family were detained at Mayapuri police station
but when Kejriwal reached they had left.
"Police saying she has been sent home in a police van. Will wait here till she reaches home," he tweeted.
Meanwhile, police officials denied that agitating students or Najeeb's family were manhandled.
"During protest by JNU students today, none have been manhandled. A group of JNU students along with Najeeb's mother assembled near Archaeological Survey of India building. They were persuaded not to move towards India Gate. They didn't agree and were adamant to move ahead. They all were taken into a bus to Mayapuri police station. Fatima Nafees was duly attended to by lady Police officers and dropped at her place of stay," a police statement said.
The protesting students had even confined the Vice Chancellor (VC) and other senior officials in the administrative building for over 20 hours last week. Following directives from the Union Home Ministry, Delhi Police formed a special investigation team (SIT) to trace the missing student.