The weekend heist in the northeastern city of Nelspruit was a blow to efforts to curb the clandestine trade in rhino horn, which has surged in recent years despite an increase in funding for anti-poaching efforts in South Africa, home to the majority of the world's rhinos.
Today, forensic investigators from the police analyzed the crime scene at the Mpumalanga Tourism and Parks Agency, and officials were exploring the theory that it was an inside job.
The robbery of "nearly 40" rhino horns occurred on Saturday night, Ramaloko said.
The thieves targeted a safe where the parks agency of Mpumalanga province keeps some rhino horn stock temporarily before transporting it to "another undisclosed location" for longer-term storage, said Kholofelo Nkambule, an agency spokeswoman. The powerful machine tool used by the robbers broke part of the safe into pieces, she said.
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Legalisation would require the approval of CITES, the international body that monitors endangered species and will meet in South Africa in 2016.
"In terms of public institutions, we have never had such a case" of rhino horn theft, said Albi Modise, spokesman for South Africa's environment ministry.
Last year, 66 rhino horns worth several million dollars on the illegal market were stolen from a private wildlife reserve in South Africa's Limpopo province, according to local media. In that case thieves reportedly used a blowtorch to break into a safe where the horns were kept.