“Upon arrival, they found 15 naked individuals, suspected to be Ethiopian nationals, held captive inside the house,” he said.
A further 11 men were taken to hospital with injuries apparently caused when they tried to escape, including deep cuts.
Three other Ethiopian nationals were arrested on suspicion of human trafficking and the illegal possession of a pistol.
Although most of the captives did not speak English, initial information received from them indicated that they were only given clothes when they were taken out of the house, Nkwalase told AFP.
Based on their information, it was “not far-fetched” to assume that 60 men had been held in the house, he said. Police did not yet have details of the men, including their ages and identities.
It was also not clear how long they had been there and, when they were taken out, where they were taken to and for what purpose, he said.
South Africa, the continent’s most industrialised nation, attracts millions of migrants, many of them undocumented and from other African countries such as Malawi, Lesotho and Zimbabwe.