A motorcyclist and his passenger have been killed in an accident in Sydney's west this afternoon.
Police say the accident happened when the motorcyclist tried to overtake a car on a sweeping bend on Mulgoa Road at Wallacia.
Police say it is believed the motorbike collided head-on with another vehicle as it was overtaking.
The rider and his female passenger died at the scene.
The female driver of the car has been taken to Nepean Hospital with minor injuries.
The RTA has advised motorists to avoid the area as road closures are in place in both directions.