Boy, 5, dies in Sydney stabbing attack

A five-year-old boy has died after being stabbed during a domestic dispute in Sydney's northwest, with police arresting a 36-year-old man.

Two crime scenes were set up, at the home on Paul Place and nearby Moseley Street in Carlingford. Source: AAP

A five-year-old boy has died from stab wounds following a domestic dispute at a home in Sydney's northwest, with a 36-year-old man in police custody.

The dispute occurred at a Carlingford property about 7am on Friday, with the boy and his grandmother rushing to a nearby street to raise the alarm.

The boy was taken to the Children's Hospital at Westmead in a critical condition and has since died, police say.

Police have arrested a 36-year-old man known to the boy.

Paramedics have treated the grandmother, aged in her 60s, for shock.

Two crime scenes have been set up, at the home on Paul Place and at nearby Moseley Street.

Police will address the media on Friday morning.