Tight security was in place in Lutyens Delhi amid reports of protest by Jawaharlal Nehru University students over the missing of Najeeb Ahmed.
Security personnel were posted around the roads leading to India Gate and traffic restrictions and diversions were put in place in anticipation of the protest, police said.
C Hexagon was closed for traffic movement, they said.
As students were detained around 5 PM while marching towards India Gate, traffic snarls were observed in the area.
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The protesting students were taken to Mandir Marg police station. Mandir Marg was closed for a couple of hours as many students stood outside the police station, said a traffic police officer.
Traffic was also affected in the city due to Chhath Puja celebrations and poor visibility over smog.
Heavy traffic was observed between Chandgi Ram Akhada and ISBT, Kalindi Kunj and Noida due to Chhath Puja, the traffic police officer added.