Khalid and Anirban declined to appear before District Magistrate Sanjay Kumar, tasked with probing the case, and sent him a 'Thank You' note'.
New Delhi District Magistrate Sanjay Kumar had on February 23 gone to Jawaharlal Nehru University to interrogate Khalid, Anirban and another JNU student, Ashutosh Kumar, hours before the first two surrendered to police.
"I wanted to interrogate Khalid. When I heard news of them (Khalid and Bhattacharya) being back in JNU after their disappearance, I went there on February 23 to interrogate them.
Khalid and Anirban are in police remand since their surrender and subsequent arrest on February 24. Police have also questioned Ashutosh twice.
On March 1, a Delhi court sent Khalid and Anirban, arrested in the sedition case over a controversial event on the JNU campus, to 14 days' judicial custody.