MUSINA, South Africa: Perched on weathered wooden rafts, small groups of people hauled themselves and their bundles of cargo hand over hand along a rope strung across the crocodile-infested Limpopo River. Minutes later, they were in South Africa, having bypassed the border post at Beitbridge, a short distance away. By the time patrol officers spotted them, the clandestine migrants had disappeared into the thorn scrub.

"Something has to be done urgently" about border security at the Limpopo river border with Zimbabwe, says South Africa's minister of Public works and Infrastructure, Dean…

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