NICASA President, Benjamin Okoli, gave the condemnation in a statement made available to the News Agency of Nigeria (NAN) on Thursday in Abuja.
According to Okoli, two Nigerians were shot dead while two others sustained injuries from gunshots by unidentified assailants in the country on Wednesday.
NAN reports that the Wednesday killings brought to five, the number of Nigerians killed this month in South Africa.
Three Nigerians were reportedly killed between April 6 and April 9 at different locations in the country.
Okoli said the association had sought the intervention of the Nigerian Mission in South Africa to strategise and bring to an end, the unwarranted bloodletting among Nigerians in the country
According to him, three Nigerians were shot at Sands Hotel Area of Berea, Johannesburg and two died instantly while one is in a critical situation in hospital.
He said that another Nigerian was shot in Pretoria but he survived with an injury on the leg.
“Information reaching us indicated that there was a meeting of some groups of Nigerians in a restaurant at Sands Hotel Area of Berea on Wednesday at about 11:00 am
“Shortly after the meeting as the people started coming out from the restaurant, a gun fire erupted and two Nigerians were shot dead,” he stated.
According to him, one of those killed hailed from Ozubulu in Ekwusigo Local Government Area of Anambra while the other was a native of Arondizuogu in Imo.
“The third victim is in a critical state and is currently receiving treatment at a hospital. We cannot confirm the name of the third victim but he is a Nigerian.
“Also in Sunnyside Pretoria on Wednesday, another Nigerian was shot on the leg in crime hot spot in the area,” he said.
The president of the association lamented that such killings had become common among Nigerians in South Africa, saying other Nigerians in the country were worried about it.
He added: “we appeal to the mission and consulate to strategise with the aim of bringing to an end, the unwarranted bloodletting among Nigerians. It is bringing shame and opprobrium.
“The remote and immediate causes cannot be established at this time.
According to him, the killings in Johannesburg may not be unconnected with “the Ozubulu crisis” while that of Sunnyside Pretoria was cult related.
