Australia Day punters have described their fear when a firework at Bunbury's skyshow malfunctioned and shot into the crowd, injuring five people.
It is the second time in less than a month that fireworks in Bunbury misfired after a woman suffered life-threatening injuries when a firework blew up in her face at New years celebrations at Bunbury's Trotting Club.
Bunbury Police Sergeant Laurie Stubbs said one of the projectiles from the fireworks display at the annual SkyFest, held at the Bicentennial Square, failed to detonate and landed in the crowd.
[It] shot straight into us all hit a tree and then exploded.Melissa Laurence
"Luckily police were right behind the crowd and rushed to the injured people to give first aid," Sergeant Stubbs said.
Five people were brought to hospital by St John ambulance, but none suffered serious injuries, he said.
Laura Sayer captured the wayward firework on her mobile phone and people can be heard screaming as a big pink fireball flies towards the people.
Melissa Laurence said she was forced to run with her grandchildren she saw the projectile flying straight towards her and her family.
"[It] shot straight into us all hit a tree and then exploded," she said.
"People did get hurt ... to what degree I don't know, I did see someone's jumper on fire ... I also know it hit a man's leg.
"But at the time I was too busy running away with my children and my grandchildren to stick around and see [what happened]."
The Australia Day SkyFest is one of the biggest fireworks in the metropolitan area, and about 40,000 people attended last year's celebration.
The incident is under investigation by the Department of Mines, Industry and Regulation.