Over 500 rhinos poached in South Africa this year

More than 500 South African rhinos have been killed this year, official figures showed Wednesday, amid strong demand for horns on the Asian black market.

"As of yesterday (Tuesday), a total of 515 rhino have been killed so far this year," said the environment ministry's deputy director general Fundisile Mketeni.

The lucrative Asian black market for rhino horn has driven a boom in poaching in South Africa, which has the largest rhino population in the world.

Many of the killings are thought to be perpetrated by poachers from global syndicates.

On Tuesday Czech authorities charged 16 people from a gang that sent registered hunters to South Africa who returned with horns that were to be sent on to Asian countries.

Customs officers seized 24 rhino horns, worth an estimated 3.9 million euros ($5.1 million).

Last year, 668 rhinos were killed in South Africa, a record high that could be surpassed if the poaching continues at today's pace.

The army's deployment in the hardest-hit area, the Kruger National Park, has done little to stem the killings.