Human Rights Watch said people were chained and faced physical and sexual violence in both state and religious centres.
The age for marriage has been raised to 18
Tuesday’s attacks are coming on the heels of efforts by Presidents Muhammadu Buhari and Cyril Ramaphosa
Police said that one man was arrested after a tip-off that he had offered around $80 (£70) to spend the night with a woman.
"The incident does not represent what we stand for," he said, adding that South African police would "leave no stone unturned" in bringing those involved to justice.
"The shooting was very close to our hostel (named B.O.T) and we were all scared.”
The grand finale of the summit was used to expose the students on the cores of journalism through lectures.
The body, which turned out to be a trap, exploded when it was handled