A man has died and two children have been seriously injured in a three-car crash on the NSW mid north coast.
Police say the male driver of one of the cars died at the scene of the collision on the Pacific Highway at Nerong about 2pm on Sunday.
Five others - two men, a woman and two children aged eight and 10 - were hospitalised.
The adults were in a critical condition on Sunday evening while the children were in a serious condition.
"This is certainly a horrific event for all emergency services to attend, particularly at the beginning of the school holiday period," NSW Ambulance Inspector Mick O'Connor told reporters.
It was the first of two fatal crashes in NSW on Sunday afternoon, with a 57-year-old male driver dying at the scene of a head-on collision between two cars in the Monaro region.
Police say the deceased's male passenger was taken to hospital in a stable condition after the 2.40pm crash on the Monaro Highway at Nimmitabel.
The driver and passenger of the other vehicle, both men, were airlifted to Canberra Hospital with serious injuries.
Meanwhile, a 45-year-old man was fighting for his life on Sunday night after his northbound Mazda sedan collided with two southbound vehicles on King Georges Road in Sydney's south.
Police say a member of the public pulled the man from his car after it caught alight in the Sunday morning crash at South Hurstville.
He was taken to hospital in a critical condition. The two other drivers weren't injured.
© AAP 2019