Uganda Christian University (UCU) Mukono has cancelled a number of examination papers for this semester on suspicion that they had leaked.
The cancellation followed an alleged arrest of one of the university's students with different examination papers similar to those which had been printed by the university.
The university students began their exams on Monday and had already finished only two papers when the incident happened.
The University's Deputy Vice-Chancellor for Academic Affairs Dr. Alex Kagume confirmed the cancellations of the exams.
"The question papers which were found with the students had questions similar to those the students were due to sit for.We think there could have been some other student with the papers, so we decided that the exams should be cancelled," Kagume said."We have summoned our staff to another set of exams."
Kagume said four students are already under investigation over the malpractice and will appear before the disciplinary committee to answer charges.
The exams were to end on December 13 but there are fears that with the cancellation of some of the papers, they could drag on after the deadline.
However, Kagume said the university has the mechanisms to ensure the exams are completed on the arranged date.
"The cancellation has only affected Foundation Studies examination papers, which are not very many. The other papers are safe," he said.
He said the university will consider outsourcing a company conversant with doing the examination for the work to avoid a repeat of the incident.