INTIMIDATING: Oscar Pistorius’ cousin got messages.

Oscar Pistorius’ family say they have received threats that the convicted killer will be “gang-raped” in jail.

The Pistorius family has laid criminal charges after receiving the threats made in a string of WhatsApp messages last week.

Police confirmed that they are investigating a case of intimidation.

The messages were sent to Pistorius’ cousin Arnoldus Kurt Pistorius on Thursday.

The threats came hot on the heels of Pistorius walking on his stumps in court and pictures of his murdered girlfriend, Reeva Steenkamp, being released to the public.

In his statement, seen by City Press, Arnoldus said an unknown person contacted him via WhatsApp on Thursday.

The sender asked him to verify if he was Pistorius’ cousin, which he did.

The person then claimed to have evidence that state prosecutor Gerrie Nel had paid prison nurse Charlotte Mashobane to lie in court.

Mashobane said Oscar had anger issues, and shouted at her on a few occasions.

Arnoldus said that he did not respond to the messages as he suspected that the sender wanted money.

On Friday, the man started making threats.

One message read: “You don’t need my help jou ma se * *** ... when Oscar returns to jail I will ensure that he is gang-raped also he will suffer and I will have my man beat him properly. Your children will be murdered as well...”

When City Press contacted the phone number, the man refused to identify himself but confirmed having contacted Arnoldus.

He denied having made death threats.

Oscar will be sentenced on July 6 for the murder of Reeva on Valentine’s Day 2013.