According to reports, the suspected groups have 50 to 60 members each and further investigation, as well as questioning by the Crime Branch of the Delhi Police, is underway.

It is believed that photographs of the Class 12 Economics and Class 10 Maths paper were allegedly circulated in the groups before the exams.

Meanwhile, students and Congress activists on Friday protested outside the Central Board of Secondary Education (CBSE) headquarters here over the leakage of Class 10 and Class 12 question papers.

It is said that question papers for Maths of Class 10 and Economics of Class 12 — examinations for which were conducted on Monday and Wednesday, respectively, this week — were in circulation for days before they came to be acknowledged as “leaks” by the board.

A flagrant act of recklessness on the part of the Anboard was also observed when it went ahead with Class 10 Maths examination on Wednesday despite being aware of the leak of Economics paper and even filed an FIR on Tuesday.

Special Investigation Team (SIT) was formed on Wednesday after the CBSE registered two cases with the Crime Branch.

The first case was registered on Tuesday evening about Class 12 Economics question paper leak and the second related to the leak of Class 10 Maths paper was filed on Wednesday.