Delhi Police sleuths, sources said on Tuesday.
Sagar Sharma, Manoranjan D, Neelam Azad, Amol Shinde, Lalit Jha and Mahesh Kumawat are in police custody till January 5. They have been interrogated for their actual motive behind the security breach, the sources added.
According to a police source, Neelam and Manoranjan are being held at the office of the Special Cell's Counter Intelligence Unit at New Friends Colony.
The other four are being held at different units of the Special Cell.
They are being interrogated by separate teams of the Special Cell.
On December 30 and 31, they were brought to the Counter Intelligence Unit's office for face-to-face questioning. The investigators wanted to corroborate the sequence of events and the role of each accused.