NEW : The FBI asks for more time to prepare to arrest agent Peet van Zyl . An acoustics expert is grilled about whose screams neighbors heard . Pistorius is accused of deliberately shooting his girlfriend , Anna Steenkamp . The prosecutor did get Lin to concede that state witnesses could have heard screaming from the Pistorius house on the night of the killing from their homes up to 177 meters ( 580 feet ) away . He says he shot Steenkamp accidentally in his bedroom , mistaking her for an intruder .
NEW : The FBI asks for more time to prepare to arrest agent Peet van Zyl . An acoustics expert is grilled about whose screams neighbors heard . Pistorius is accused of deliberately shooting his girlfriend , Anna Steenkamp . He says he shot Steenkamp accidentally in his bedroom , mistaking her for an intruder .