Four people have been killed in a two-car crash on the Newell Hwy at Tomingley, 54km southwest of Dubbo.
The ute and a van collided about 9.20pm on Friday.
Two young men in the ute, aged 18 and 19, and an older man and woman in the van, both aged 57, died at the scene.
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The 23-year-old male driver of the ute survived the crash, and was taken to Dubbo Hospital with suspected leg injuries.
When asked if speed played a role in the crash, NSW Police Inspector Rob Bevern said all factors were being investigated.
“We’re not too sure at this stage what has caused it,” Bevern said on Saturday.
“There’s a number of factors that would have caused this crash overnight, but this stage is too early to determine.”
All of those involved in the accident were locals from the greater central west region, Bevern said.
“The impact will be greatly shared across the region, not only through the close-knit community but also through the emergency services personnel that attended,” he said.
“All we can say is, as the school holidays roll around, please drive to the conditions, drive to the speed limit, and don’t die for a deadline.”
Investigations are ongoing, and a report will be prepared for the coroner.
-With AAP