Five adults and two children have been taken to hospital after a four-car crash at Blaxland, in the Blue Mountains, on Sunday morning.
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Emergency services arrived at the scene on the Great Western Highway about 10.40am.
TRAFFIC: Local diversions underway on the Great Western Highway after an earlier collision at Blaxland. #9News pic.twitter.com/E1YkQ32kKk— Nine News Sydney (@9NewsSyd) February 5, 2017
FYI Only - The Great Western Highway is Closed at Blaxland in both directions due to a serious accident. Please... https://t.co/WSvrqsK6lo— Winmalee RFS (@WinmaleeRFS) February 5, 2017
NSW Ambulance paramedics treated a total of 11 of people at the scene.
Police initially reported three adults had been taken to Westmead Hospital in a serious condition, but a hospital spokeswoman has since confirmed that just one female was admitted in a serious condition.
Four adults were taken to Nepean Hospital with minor injuries, including two women aged 32 and 33, and two males, both 37.
Two children were taken to Westmead Children's Hospital, and were discharged later on Sunday afternoon.
Those who were taken to hospital had suffered a variety of chest, neck, leg and hand injuries.
The Great Western Highway reopened in both directions at 4.15pm after significant traffic delays in the area.
The vehicles involved in the crash have been removed from the highway.
Senior Transport Information Manager Alf Paranihi said traffic still remains heavy for vehicles moving eastbound on the highway. There are minimal westbound delays.
Blue Mountains Local Area Command officers have launched an investigation.