He said the decision by the parole board to free the athlete after serving 10 months of his five-year sentence was premature and without legal basis.

It could now take months for the board to review its decision, legal sources told the BBC.

Pistorius was convicted of manslaughter last year after shooting dead his girlfriend Reeva Steenkamp.

The Olympic athlete insists he mistook her for an intruder.

He was due to be transferred from prison to house arrest on Friday, when he was expected to stay at his uncle?s three-story mansion in the capital, Pretoria.

Under South African law, Pistorius is eligible for release under ?correctional supervision?, having served a sixth of his sentence.

One of his relatives, who did not want to be named, told Reuters news agency they were ?shocked and disappointed? at the news.

In a statement, South Africa?s Justice Minister Michael Masutha said the decision to free the athlete was taken prematurely.

?One sixth of a five year sentence is 10 months and at the time the decision was made Mr Pistorius had served only over six months of his sentence,? the statement said.

Thursday would have been Ms Steenkamp?s 32nd birthday.

Her parents held a small ceremony for her close friends and supporters in her hometown of Port Elizabeth, throwing roses into the sea in her memory.

This week, prosecutors filed court papers calling for the athlete?s conviction to be converted to murder, which carries a minimum sentence of 15 years. His defence team has a month to file its response.

During sentencing, Judge Thokozile Masipa said the state had failed to prove Pistorius? intent to kill when he fired.

The double amputee shot and killed Ms Steenkamp through a locked bathroom door at his Pretoria home, believing she was an intruder, he told his trial.

Pistorius was born without the fibulas in both of his legs, and had surgery to amputate both below the knee while still a baby.

He went on to become one of South Africa?s best-known sports stars, and was the first amputee to compete against able-bodied athletes, at the 2012 London Olympics.



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