The duo, who returned to the JNU campus last Sunday after having gone missing since February 12, drove from the administrative bloc to the main gate of the university, got into a Delhi Police vehicle and were taken to an undisclosed destination.
Police sources said Khalid and Bhattacharya surrendered at around midnight.
The two have been placed under police custody at South Campus police station. They will be produced before a magistrate tomorrow morning, the sources said.
Besides Kumar, Khalid and Bhattacharya, the other students are Rama Naga, Ashutosh Kumar and Anant Prakash.
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Delhi Police had issued a look-out notice on February 20 against Khalid, Bhattacharya, Naga, Ashutosh and Prakash.
Earlier, Khalid and Bhattacharya left the JNU campus at around 1150 pm tonight for the surrender.
The university students formed a human chain to prevent the media from following Khalid and Bhattacharya when they were leaving the campus this evening.