A witness heard "non-stop shouting" coming from the home of Blade Runner Oscar Pistorius before he shot his girlfriend dead, a court in South Africa has been told.

Prosecutor Gerrie Nel said the prosecution team had a witness who heard shouting coming from the property at the exclusive Silver Lakes Golf Estate between 2am and 3am. Shortly afterwards Reeva Steenkamp, 29, lay bleeding to death in Pistorius's bathroom hit by three bullets, one in the head, the hip and arm, Pretoria Magistrates' Court heard.

Pistorius has admitted shooting her with a 9mm pistol but said he thought a burglar or burglars were in the bathroom and he did not intend to shoot the model.

The athlete has said he believed intruders were in his house so he fired through the bathroom door in the dark as he was too scared to turn the light on. Discovering his mistake, he broke the door down with a cricket bat and carried her downstairs, he has said. But investigating officer Hilton Botha said the prosecution also have a witness who said the lights were on after hearing gunshots. Lawyers and police studied plans of the bedroom and bathroom.

Mr Botha said there was "no way" he believed Pistorius's version of events. The runner has said he shot through the door while on his stumps but the court heard the bullets' trajectory was through the top of the door.

Mr Botha said he believed the bullets were fired down, suggesting that Pistorius was wearing his prosthetic legs when the shots were discharged. He said: "I believe he knew she was in the bathroom and he shot four shots through the door."

The court heard that two mobile phones were seized at the property and neither had been used to call the police or paramedics. The court also heard that two boxes of testosterone and needles were found in Pistorius's bedroom. Pistorius's lawyer Barry Roux said it was not testosterone but a herbal remedy.

Details were also released of a row he allegedly had with a man over a girl at Kyalami racetrack where Pistorius allegedly threatened to "f*** up" the rival. It was also claimed he was involved in another shooting at a restaurant in Johannesburg in January and asked the gun owner to take responsibility for the incident. Mr Botha said he wanted Pistorius charged additionally with a weapons violation after unlicensed .38 calibre ammunition was found at the house.

In an affidavit, Pistorius has denied murdering the law graduate at his home in the early hours of Thursday. He has said they were in love and he thought Miss Steenkamp was in bed when he got up in the dark and blasted through the door. The hearing was adjourned to Thursday morning when a decision over bail might be made.

One witness said he heard a shot, followed 17 minutes later by more shots, Mr Botha said. "One of our witnesses heard a fight, two people talking loudly at each other... from two in the morning to three,'' he said, adding that the witness was about 1,000ft away.