Police spokesperson Col Moatshe Ngoepe said the cause of Thandi's death was unknown at this stage, but investigations were under way.
Ngoepe said the suspicion and allegations that the deceased might have been raped before she was killed, would be confirmed by postmortem examination, which was yet to be conducted.
MEC for community safety Dickson Masemola said he was still shattered after seeing Thandi's lifeless body.
"She was still in her school uniform. And this incident happened not far from her school," he said.
Addressing a group of mourners and family members yesterday, MEC for education Polly Boshielo called for men to stand up against the persistent abuse of children and women.
Boshielo, who couldn't hold back her tears, said: "As women we are tired of crying, we are tired of burying women every day. We don't know what to do anymore."
Premier Stan Mathabatha said he learnt with shock about the incident.
"I think I'm beginning to agree with the ANC Women's League that we should consider chemical castration on rapists. Rapists don't deserve to live among ourselves in the community," he said.
Ngoepe said they were requesting Bheka Rapolai, a local man, to come to Nebo police station to assist with investigations.