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Police in South Africa arrested more than 100 undocumented foreigners living in a house east of Johannesburg on Friday, some as young as 10 years old.

Police arrested them following a tip-off and invited immigration officers along, Home Affairs Minister Aaron Motsoaledi told local television stations.

The group consisted of 98 Ethiopians and four Malawians in a house in Primrose, 14 kilometres (nine miles) east of Johannesburg, said Motsoaledi outside the local police station

"Some are as young as 10 years old," he added.

Some of them were rushed to the hospital for treatment for malnutrition and dehydration.

Motsoaledi said the Ethiopian running the house had been a refugee in the country since 2019, having renewed his status four times.

"From what I can understand they are brought here to run the spaza shops (general stores) around the whole country" he added.

The Home Affairs Ministry said it had found only four passports in the house and no South African visas.

All 102 foreigners were crammed into one house with poor living conditions and no furniture—just blankets all over the floor, dirty pots, dirty plates," according to the ministry.

Motsoaledi said that some of the foreigners were "clearly victims", adding that a trafficking syndicate could be involved.

"I think the house is being used to bring people into the country and distribute them to whoever wants cheap labour," he added.

Processing the illegal migrants will be a lengthy process, according to the ministry. It will work with social services to determine whether any of them were trafficked into the country.

South Africa, the continent's most industrialised country, is buckling under a wave of illegal migration triggered by the economic woes of its neighbours.

Many come from Malawi, Lesotho, and even the horn of Africa, but most are from Zimbabwe.

Police have recently scaled up stop-and-search operations in a bid to catch undocumented migrants.