NSW Police and emergency services are currently on scene at The Hume Highway after a large gumtree fell on five cars in Warwick Farm.
Four people have been taken to Liverpool Hospital, a woman is in a serious condition and three men remain stable.
The Hume Highway at Warwick Farm has been closed in both directions as crews attempt to clean up debris and clear the road.
Motorists are urged to avoid the area and for latest traffic information, visit www.livetraffic.com.
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