The Joint Admissions and Matriculation Board on Friday cancelled the ongoing Computer-Based Test (CBT) at the Utako Success CBT Centre in Abuja.
Officials of the examination body said the affected candidates would be rescheduled, with new dates to be announced in due course.
Candidates and their parents were advised to remain calm and await further updates from the board.
The development comes amid the ongoing nationwide Unified Tertiary Matriculation Examination, with JAMB assuring that no candidate would be disadvantaged by the disruption.