Uganda National Examinations Board (Uneb) executive secretary Dan Odongo says preliminary investigations have traced the leakage to storage station in Busesa.
"The scout sent to guard the exam confessed that he was paid Shs 1 million to give his keys to perpetrators of the fraud," Odongo told journalists in Kampala today.
They include private school teachers, a student, a director of a private school and bursar of a government school among others.
Odongo says the involvement of teachers is an "indictment of teachers who have made education a business."
"Our scouts from other parts of the country have told us that examinations in their areas were going on well and were not affected by news of the examination leaks."
"Until the impact is established, we shall not know what appropriate measure to take to handle the after effect of the exam. So for now we do not know whether we shall cancel the exam or reduce or increase the pass mark. We shall only know what to do after we establish what can be done."