The owner of the house was among those killed and it is unclear what the motive for the shooting was, police said.
“Preliminary investigations at this stage have revealed that the owner of the house was celebrating his birthday between 5:15 and 5:30 p.m. when two unknown gunmen entered the garden on Makanda Street in Kwazakhele and started shooting at the guests,” Naidu said.
She said seven people died at the scene, while the eighth victim succumbed to their injuries in hospital.
“These victims were murdered by criminals and we will not rest until we find out what happened and who was responsible for these callous and cold-blooded attacks on these unsuspecting victims,” Naidu said.
Police Minister Bheki Cele and other police officials visited the scene of the incident on Monday and spoke to local residents.
“We know everyone is hurt and angry. We would have liked to have responded quickly, but we will request some space so that we can do the work thoroughly so that by the time we respond there is no speculation,” Cele told reporters at the scene of the incident.
No arrests have been made, but a manhunt for the suspects is underway, police said.