The accused Shekhar Kapasia and the juvenile were caught this morning from Muzaffarnagar, Uttar Pradesh, police said.
Kapasia is pursuing B.Com (Hons) from Aurobindo College in Malviya Nagar while the juvenile is a political science student of School of Open Learning.
They were identified from the CCTV footages retrieved from a liquor shop near the metro station and the North Campus.
They are friends and were from the same school in their hometown and attended the same English coaching classes. The 19-year-old is a resident of Sant Nagar in Burari while the juvenile is a resident of Vijay Nagar, police said.
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During their interrogation, sources said, the two told the police it was one of Kumar's friends who was urinating outside the station in the open to which they had objected.
They claimed that following their objection, Kumar "abused" them and made some "obscene gestures" that enraged them.
Police said their version of the incident will also be investigated.
Five more persons have been identified and raids are being conducted to nab them, said Rajesh Khurana, joint commissioner of police, Northern Range.
The two had left for their hometown after appearing for their last exam last week. It was only after they saw the news of the incident on the TV that they realised Kumar had died, police said.
They were planning to escape from Muzaffarnagar but were nabbed before they could do so, they said.
The incident had triggered widespread outrage with even Prime Minister Narendra Modi condemning the killing and directing the authorities to bring the culprits to book.
The NDMC mayor today handed over a job letter to Kumar's widow.
Yesterday, the Crime Branch was also roped in to assist a probe into the killing.
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