India, June 27 -- What prompted Bilal Teli, 22, to attend lectures and stay on campus at the Indian Institute of Technology Bombay, until an alert employee called his bluff? Teli, who hails from Mangaluru, was not a student of the premier engineering institute and yet he managed to deceive lecturers, students and campus security for 19 days.

Teli was nabbed on June 17 but, even a week after questioning, police claim to have made little headway in the case. The only leads they have are digital - the 22 email addresses Teli was using and phone calls made through digital apps, which they hope will help them uncover the motive for his stint at the IIT campus.

On Thursday, a local court remanded Teli to the custody of the Crime Intelligence ...