JAMB Registrar, Ishaq Oloyede, made this known while addressing newsmen at   Digital Bridge Institute, Abuja, one of the centres used for the computer-based exercise.

He said that about four centres encountered technical problems while one was being investigated for malpractices.

The week-long exercise which began on Saturday is expected to end on  Saturday, May 21.A total of 1.7 million candidates are participating in the exams which is meant for students seeking admission into institutions of higher studies in the 2017/2018 academic session.

The JAMB Registrar also said the morning session examination started late in some centres while in others it started at the scheduled time.

“Out of 642 centres, we had problems with four in Bauchi, Kano, Uturu (in Abia State) and Ekpoma (in Edo State).

“Everything was okay, there was a little disturbance in Ekpoma and we are monitoring what is going on.

“There was a little problem in Uturu; we are monitoring what is happening there too,” he said.

He also said the exercise was delayed in Maiduguri for a while due to the bomb blast in the University of Maiduguri in the wee hours of Saturday but that the examination had since commenced.

“Due to what happened over night and because of the militarisation of the campus, we had to delay the commencement of the exams in Maiduguri.

“Also the Seventh Day Adventist will not have exams in all the centres nationwide on Saturday,” he added.

Seventh Day Adventists are a Christian group that observes Saturdays as a holy day instead of Sunday.

Also speaking with journalists, a staff of the Digital Bridge Institute, Enobong Bassey, said everything went according to plan and there were no hitches.

“Everything went smoothly, the examination was to start 8 am and all the students were seated by 10 minutes to eight,” he said.

“Though a few students came late because of the grace period, they were able to write.

“Where there was any issue with any system, there was no problem because we had sufficient backup system.”

Some of the candidates that spoke to the News Agency of Nigeria, NAN, also confirmed that the examination went well and they had no challenge using the computers.