Pistorius lawyers quiz key witness

Mr Pistorius has pleaded not guilty at the start of his trial for the murder of his girlfriend Reeva Steenkamp.

He shot dead the 29-year-old model and reality TV star at his home, saying he mistook her for an intruder.

The neighbour, Michelle Burger, said cries for help were followed by shots.

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At the scene

Pumza FihlaniBBC News, Pretoria

There is much heavier rain here as the second day of the trial gets under way in the capital - so there not so many people crowded the entrance to the court, although the media are still here in force.
There is massive interest in the case - it is possibly the most publicised case since Jacob Zuma was cleared of rape in 2006, three years before he became president.
And it does not take much for matters to become political here. Outside court on Monday, members of the local African National Congress Women's League, sang struggle songs, telling me: "We are here for Reeva; she was killed and we want answers."

• Eyes of the world on a fallen hero

"She screamed terribly and she yelled for help. Then I also heard a man screaming for help. Three times he yelled for help," Ms Burger told the high court in the capital on the first day of the trial.

She said she called security and then heard four gunshots.

The arrest of the national sporting hero astounded South Africa.

The 27-year-old double amputee won gold at the London 2012 Paralympic Games and also competed at the Olympics.

For the first time in South Africa, parts of the trial are being televised live, although Ms Burger's testimony, in Afrikaans, is being relayed in audio.

Some witness testimony is being excluded from TV broadcasts, although audio of the entire trial is being broadcast.

The court has been briefly adjourned on the second day as there are concerns that her face may have been shown on television as questioning began on the second day of the trial.

There is heavy rain in Pretoria on the the second day of the trial as Oscar Pistorius arrives at the court

There is huge interest in South Africa and around the world about the trial

South Africa was stunned when the athlete shot dead his girlfriend, Reeva Steenkamp

The BBC's Andrew Harding in court says defence lawyer Barry Roux began his remarks by outlining what he would focus on with Ms Berger's testimony today: Her credibility and reliability.

On Monday, Mr Pistorius pleaded not guilty to all charges, including the "wilful and intentional murder of Reeva Steenkamp" as the trial began.