Oscar Pistorius's jail sentence increased to 13 years and five months

Former South African sprint runner Oscar Pistorius's jail sentence has been increased to 13 years and five months for the murder of model and celebrity girlfriend Reeva Steenkamp, it emerged on Friday.

Prosecutors argued that the six-year term was "shockingly light" considering the Paralympian had fired four bullets into a bathroom door behind which Ms Steenkamp was hiding unarmed.

The Supreme Court of Appeal in Bloemfontein, South Africa, has now sentenced Pistorius to a minimum of 15 years for murder, as normally prescribed in South Africa.

The Steenkamp family spokeswoman said the parents of the victim were "emotional" as they observed the ruling from home and now feel a sense of justice for Reeva.

Pistorius was given a six-year sentence after the lower court argued mitigating circumstances such as rehabilitation and remorse, which they believed outweighed his failure to fire a warning shot.

The six-time Paralympic gold medalist reportedly shot the model four times through a locked toilet door at his home in Pretoria, the capital of South Africa.