The Class 10 biology paper was leaked Tuesday in Karachi before the start of the exam, reported 24NewsHD TV channel.

The exam was being conducted under the Board of Secondary Education, Karachi. The paper went viral on social media after it was leaked.

Earlier, the Class 9 physics paper was also leaked on Monday last. The leaked papers had no reach to social media earlier due to the internet shutdown.

The previous records of irregularities in the holding of exams under the Karachi board have been broken this year. The alleged sale and purchase of the examination centres are still going on.

Due to the overnight change of the examination centres, thousands of students are allegedly taking exams in place of the real candidates.

Reporter: Syed Zubair Rashid