Thousands poured into the South African city's FNB stadium for Global Citizen Festival: Mandela 100.
Get more news down below.
It honoured the centenary of Nelson Mandela and aims to end extreme poverty by 2030.
While the Global Citizen Festival went off largely without a hitch yesterday, there have been several reports of muggings after it ended.
Makhura said he was "disturbed by criminality" after the festival at FNB Stadium in Soweto.
The Johannesburg Police Department arrested seven suspects at the Global Citizen Festival for, amongst others, common robbery and assault of a police officer, the City of Johannesburg said on Monday.
South African media say a concert worker died in a stadium fall Saturday.
It said it was "saddened to hear the challenges people had while leaving the venue".
"We find that there's a lot of communication taking place on the social media platform, but that is not being reported to us", said, Naidoo, adding that it is therefore "very hard for us to deny or even confirm that such things have happened".
Fellow performers at the event included Pharrell, Chris Martin, Eddie Vedder, Usher and JAY-Z, who joined his wife on stage for a ferocious performance which including singles like "Apesh*t and "Holy Grail".
We as stadium management were not involved in the safety and security of the event as we would normally have been as we did with the Guns N' Roses concert last week Thursday", Grobbelaar said. Some World Cup soccer matches were successfully held there when South Africa hosted the tournament in 2010. He was South Africa's first black president and a global inspiration.