A nurse who gave CPR to a young scooter rider fatally injured in a collision with a car says she will not soon forget the cries of the child’s parents.

Tributes for the 11-year-old boy are growing at the scene of the Easter holiday tragedy south of Perth.

The child was riding his scooter down a driveway when he crossed into the path of an oncoming Mazda about 5.10pm on Monday.

Nicole Jones, an off-duty nurse, was driving past the incident on Mandurah Tce near Stewart St in Mandurah when she stepped in to help, performing CPR on the boy before paramedics arrived.

“There was a lot of blood, a lot of people around kind of not sure what to do,” she said.

“So I just stopped, got out of the car, directed everyone ‘get him off the road, let’s get him on his back’.

“He obviously wasn’t breathing, didn’t have a pulse, so we started CPR.”

The young boy had been at a friend’s house and was on his way home on a push scooter when the collision pccurred.

The boy suffered critical injuries and was taken by ambulance to Peel Health Campus but could not be saved.

7NEWS understands he was not wearing a helmet.

“My thoughts go out to his mum and his dad mostly,” Jones said. “I don’t think I’ll forget their cries for a good while now.”

The 46-year-old male driver of the Mazda stopped at the scene and witnesses said he was visibly distraught.

“I said ‘look, you can’t do anything more. It’s better you don’t watch’. I just covered the whole view because he was literally looking at this boy (who was) dying,” Mandurah resident Kate Bif said.

The boy’s death was the fifth on WA roads over the Easter break.

“We’ll continue to make sure we do what we can as a government and that goes to making sure our roads are safer, making sure we’ve got targeted messaging to change driver behaviour, and continue to educate the community about the importance of road safety,” WA Premier Roger Cook.

Major Crash is investigating and anyone with information should contact Crime Stoppers.