Emergency services are responding to a three-car crash at Leppington this morning.
Paramedics and other emergency services are attending to at least four patients on scene on Camden Valley Way, including two children.
One child is currently trapped.
Four NSW Ambulance units are responding to the incident.
The crash is believed to have happened about 8.15am.
Two of three northbound lanes are closed at the approach to Bringelly Road.
Motorists are advised to exercise caution and allow extra travel time.
Keep up to date with traffic flow at livetraffic.com.