Pistorius, now 37, has spent about eight and a half years in jail as well as seven months under home arrest.
He has spent over 8 years behind bars.
The five-storey building was in central Johannesburg.
It is still unclear what led to the blast.
Pilto was praised for keeping a cool head.
"While we welcome today's decision, today is not a cause for celebration."
The 25-year-old mother and her daughter were visiting the Kuleni Game Park near the port city of Durban.
The men were a gang of illegal miners.
Riaan Naude was found dead next to his truck in Limpopo, the northernmost region of South Africa.
