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Yazel Ney agreed to speak to reporters outside her home in Marayong on Wednesday and said sorry to the family of Michaela Dunn, 24, who was killed in yesterday's attack, writes Tim Barlass.

Ms Ney also said it was "obvious that there has been a steep descent into insanity" regarding her brother's behaviour, but she did not want to comment on whether mental health services had let him down.

"I don't want to like say anything about that because then that's like it's like blaming the services, when they could have been doing all they can. Do, you know, I feel like that's unfair," she said.

"[I am] shocked, angry, disgusted. I hate my last name. If someone in your family did this, like, how would you feel? I'm, like, I'm no threat to myself, sorry, I want to be clear about that.

"I wish there was a way that I could make it all better for [my mother], but I can't. I can't make it better for anyone else and I wish I could."