An eight-year-old girl is missing in north-west Sydney, police say.
The girl, Courtney Graham, left her home at Phillip Place, McGraths Hill, about 8.30am today after a family fight but failed to turn up at her school.
About 9.25am, the school informed Courtney's parents that she was not in class.
Her disappearance was "not normal", a police spokeswoman said.
Police are searching the Windsor area with the help of Polair.
Courtney was last seen walking towards a bus stop on Andrew Thompson Drive in McGraths Hill. She is about 140 centimetres tall and slim with brown hair and eyes.
She was wearing a dark green zip jacket and pants with a yellow polo shirt.
Police appealed for anyone with information to phone Crime Stoppers on 1800 333 000.