Three killed in country NSW crash

Three people are dead and a teenager is in hospital after a single vehicle accident in NSW's northwest.

Police say the car left the road at Maules Creek near Narrabri and rolled, killing an elderly couple and their son about 12.20pm (AEDT) on Sunday.

Their ages are not yet known.

The fourth occupant, a 15-year-old boy, was airlifted to Tamworth Hospital with non life-threatening injuries.