Pretoria: A witness heard "non-stop shouting" coming from the home of Paralympic star Oscar Pistorius shortly before his girlfriend was shot dead, prosecutors said on Wednesday.

A bail hearing for Pistorius, accused of murdering his girlfriend Reeva Steenkamp, reopened in Pretoria.

Pistorius arrived at the court building in a police car with a blue blanket covering his head on Wednesday as prosecutors prepared to outline in more detail why they believe the double-amputee Olympian murdered his girlfriend and should be denied bail.

The 26-year-old Pistorius sat in the back of the car, which was in a convoy of three police vehicles that entered the Pretoria Magistrate's Court through a side entrance ahead of the second day of his bail hearing.

Pistorius had told the court on Tuesday he shot the model and law graduate through a locked toilet door at his home, thinking she was an intruder. He said the couple had been asleep in bed.

He wept uncontrollably in court on Tuesday as defence lawyer Barry Roux read out an affidavit in which the athlete described shooting Steenkamp, 30, in a blind panic through the door, thinking she was an intruder.

In contrast, lead prosecutor Gerrie Nel painted a picture of a premeditated killing, a crime which carries a life sentence in South Africa. "If I arm myself, walk a distance and murder a person, that is premeditated," he told the packed courtroom on Tuesday.

The hearing is expected to conclude by the end of the week.

Prosecutor Gerrie Nel told the court on the first day of the hearing that he would elaborate on the state's version that the 29-year-old Steenkamp and the world's most famous Paralympic athlete had a fight the night of her death and that she fled to the toilet before Pistorius shot four times into the locked door of the toilet enclosed in his bathroom, hitting her three times and killing her.

Since Pistorius has been charged with premeditated murder, the magistrate said his defense must offer "exceptional" reasons for him to be freed on bail.

"She locked that door for a purpose. We'll get to that purpose," prosecutor Nel told a packed courtroom, which had a capacity of 60 but was crammed with around 100 people on Tuesday.

Also read: Pistorius formally charged with murder | Paralympic star Pistorius shoots girlfriend dead