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 were called to Clower Ave in Rouse Hill, in Sydney’s north-west, on Thursday 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 had been hit by a ute about 3.45pm.

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 ute driver was taken to hospital for mandatory testing.

NSW Police seized both the ute and the scooter for examination.

A crime scene was set up as police investigate the circumstances around the incident.

Meanwhile, in Queensland, police said a high school-age boy riding an e-bike collided with a primary school-aged boy riding the same type of vehicle on Thursday afternoon at Mountain Creek on the Sunshine Coast.

The younger boy was taken to Sunshine Coast University Hospital in a critical condition, but later died.

The high school student refused medical treatment, but is assisting police with their inquiries.

-AAP