In an official statement, CBSE said that the board had taken into consideration "certain happenings in the conduct of certain examinations".
Students who have appeared for the class 10 maths and class 12 economics examinations can stay visiting the CBSE official website, cbse.nic.in to check the rescheduled dates.
The Delhi Police, on the other hand, has set up a Special Investigation Team (SIT) to investigate the class 10 Maths and class 12 Economics question paper leak.
Karwal had reportedly received a copy of the allegedly leaked class 10 mathematics paper.
Reports state that many students claimed that nearly all the papers had been leaked a day before the examinations and demanded that if a reexamination is to be held, it should be held for all the subjects. Shashi Tharoor, Congress leader tweeted his discontent with the CBSE by saying, "the CBSE leak is a disgrace & accountability is essential". These question papers were leaked a day before the exam. The date will be announced "after taking into consideration the dates of other professional exams and logistics".
According to top sources in the Delhi Police, investigation is now focusing on the role of CBSE officials, invigilators and school staff, coaching centres and printers.
The CBSE, however, denied any leak and urged students and parents not to panic.
While talking to media over the issue, Human Resource Development Minister Prakash Javadekar said, "2-3 papers had been leaked on WhatsApp 30 minutes before the exams".
"Total 25 people have been questioned so far".
Javadekar assured that culprits behind the paper leak will not be spared. "Business studies and accountancy papers were also leaked", the teacher claimed.
The case was reported to the Delhi police and an investigation was launched.