Mumbai, Sept. 25 -- The Mumbai Crime Branch has so far recorded the statements of 20 people in connection with the suicide case at IIT Bombay, according to sources.

The statements include those of students and some staff members of the institute. Investigators have also recorded statements from students who were present in the examination hall and teachers who were supervising the examination.

Statements of hostel staff members have also been recorded as part of the investigation.

Meanwhile, the statement of Professor Suryanarayana Doolla has not yet been recorded, according to sources.

The deceased student's mobile phone is secured with a pattern lock, due to which investigators have not yet been able to ascertain whom he had called ...