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The health of the nine-month-old baby who was stabbed in the Bondi Junction attack on Saturday has improved again, with her condition upgraded to stable at Sydney Children's Hospital this afternoon.

NSW Health officials made the announcement this afternoon, after the child had previously been in a serious but stable condition.

The baby's 38-year-old mother, Ashlee Good, was killed while trying to save her young child during the stabbing attack at Westfield Bondi Junction last weekend.

READ MORE: Three brothers, friend killed in horror crash

"Some patients have been treated and discharged, while six patients continue to receive care in hospital for their injuries", a NSW Health spokesperson said.

As of noon today, two patients remain at St Vincent's Hospital – a man and woman who are both stable.

Two patients are also still at Royal Prince Alfred Hospital.

One is a woman who remains in ICU in a serious but stable condition, while the other is a man in a stable condition on a ward.

Another female patient is at Royal North Shore Hospital in a stable condition.

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Three brothers and a close family friend have been identified as the four people killed in a crash in Western Australia's Wheatbelt region overnight.

Police believe the silver Nissan Navara ute was travelling east on the Great Eastern Highway in Clackline when it left the road and hit a tree about 12.30am.

Superintendent Gene Pears confirmed the brothers, aged 21, 19, and nine, were travelling with a 45-year-old family friend from New South Wales.

READ MORE: Inside Westfield Bondi Junction for the first time since attack

All four people inside the car suffered catastrophic injuries and died at the scene.

Pears described the scene today as "very confronting".

"We're providing support for all of the people that attended this morning who did an amazing job under extremely hard conditions," he said.

"My heart goes out to the families. When you lose three young men in the prime of their life and their friend, this will have lifelong impacts for that family, for their friends, and for our community."

Clackline is located in the Wheatbelt region, about 80 kilometres north-east of Perth.

Major Crash investigators are urging anyone who saw the car travelling in the area prior to the crash, to contact Crime Stoppers on 1800 333 000 or online at www.crimestopperswa.com.au.

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