Itanagar, Sep 23 (IANS): Hundreds of candidates appearing for the Arunachal Pradesh civil service exams staged a protest here Tuesday demanding an inquiry into the alleged leak of a question paper for the main examination.

According to students, the General Studies-2 question paper was a copy of the extra set of question paper prepared for 2011 mains exam and was already with many students.

"Firstly the set of question paper was a ditto copy of General Studies Paper-2 of 2011 and secondly the said question paper was already in circulation and possessed by some candidates since Nov-Dec 2013," Oyam Saring, a candidate told IANS.

Arunachal Pradesh Public Service Commission prepares 2 sets of question papers to meet any eventuality.

Earlier the students had protested outside Chief Minister Nabam Tuki's official residence following which the commission had postponed the exam until further notice.

"The candidates are shocked how the question paper which is kept in a secured room came into the hands of some candidates. The officials have also shown their laziness by copy pasting questions from the extra paper of 2011 exam," Saring said.