Two primary school students are dead after separate road accidents in two Australian states.

A five-year-old girl on a scooter was killed in a tragic collision with a ute outside a school in north-west Sydney, while a primary school-aged boy also died after two e-bikes collided on the Sunshine Coast.

Authorities attended Clower Ave in Rouse Hill, in Sydney's northwest after reports a pedestrian had been hit by a car outside the Rouse Hill Public School.

Officers were told a five-year-old riding a scooter on the footpath was hit by a ute about 3.45pm on Thursday.

The girl was treated by paramedics and then taken to Westmead Children's Hospital in a critical condition, but later died.

The 43-year-old driver of the ute was taken to hospital for mandatory testing.

Police seized both the

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