Several angry students and parents staged protest on Thursday in Bengaluru over repeated 12th standard question paper leak and demanded the resignation of Education Minister K. Ratnakar.

The chemistry exam had been scheduled for today after a student alerted education authorities that the question paper for the March 22 exam had been leaked. The government has asked the Criminal Investigation Department (CID) to look into the leak.

At 3.30 am, the CID told the Department of Pre-University Education that the chemistry question paper had been leaked again and students should be advised not to come to the exam centres.

The investigation officers told the government that the leak was detected in two places across the state.

The CID reportedly sent education officials three question papers that were in circulation hours before the exam. One of them matched the question paper.