Emergency services were called to a home in Campbelltown just before 8pm today.
They found the bodies of two children and a woman inside.
A 47-year-old man was arrested at the scene and taken to Campbelltown police station.
There was a large police presence tonight on the street, where police had established a crime scene.
The home was cordoned off with police tape and multiple police vehicles with flashing lights were parked up and down the street.
Police could be seen in the front yard of the home.
Campbelltown detectives are investigating with the help State Crime Command’s homicide squad.
Police called on anyone with information to come forward.
They are expected to address the media later tonight.
Support is available from the National Sexual Assault, Domestic and Family Violence Counselling Service at 1800RESPECT (1800 737 732).
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