Mumbai Crime Branch has today detained six people for interrogation in connection with the leak of questions of two engineering examinations conducted by University of Mumbai last month. According to crime branch officials, among those detained include two university employees and some students. As a part of its probe, the crime branch unit has questioned over 20 students till now.According to police sources, scanned copies of the Applied Physics-11 paper had been uploaded on Facebook. They said questions from the Basic Electricals paper had also been leaked. The exams took place as per the schedule as university officials initially denied any leak.