Angry Soshanguve community members burnt down the houses of two suspects in the Masego Kgomo murder case, the City of Tshwane said.
Spokeswoman Console Tleane said two houses in Block F West, Soshanguve, were torched on Thursday around 10.30pm.
He said the occupants of the houses had fled and no one was injured during the incident.
"The third house was saved through the intervention of the Tshwane Metro Police and the SAPS," said Tleane.
One man was arrested for public violence.
Tleane said community members were angry at the men who were suspected to have killed the 11-year-old girl, whose badly decomposed and apparently mutilated body was found hidden in a dense clump of bushes near her Soshanguve home on January 8, after she had gone missing.
Tleane said three men were arrested for her murder and were alleged to have cut of some off parts of her body, possibly for muti.
They were also suspects in the murder cases of three other young Pretoria girls.
The men are expected to appear in the Soshanguve Magistrate's Court on Friday.