Both students are being probed by the special cell of the Delhi police on sedition charges after they had allegedly organised a pro Afzal Guru event in which anti national slogans were raised.
A Delhi court which heard the application by the police extended custody by another day.
The Delhi police told the court that they needed them in custody as the investigations were still on. The police said that they are in the process of identifying more persons alleged to be involved in the event and hence needed more time to interrogate the duo.
On Saturday, the court had granted the police two days custody of Khalid and Bhattacharya. The Delhi police had sought for seven days custody, but that was not granted by the court.
Both Bhattacharya and Khalid are being questioned in connection with the February 9th event held at the JNU. The event held to celebrate the martyrdom of Afzal Guru also witnessed anti-Indian slogans being raised.
While the police arrested JNU student leader Kanhaiya Kumar, they had issue a look out notice against Khalid and Bhattacharya.
However, the duo surrendered before the police last week.
The police say that they have admitted to organising the event but denied the anti India sloganeering. The police are also on the look out for 20 more persons who are believed to have been part of the crowd which raised the anti India slogans.