A local mother is warning others to check playgrounds before letting their kids explore after making a dangerous discovery.
Aimee Jansen took her children to The Harbour Playground in Secret Harbour on Sunday when she spotted a piece of fishing line tied tightly between climbing ropes.
After removing the line, the mother-of-three took to social media to warn others.
"If a child had found it or run through it, the injury, it could have been fatal, it's right where the neck would go," she told 9News Perth.
"Have that safety talk with your children, tell them to have a look at their surroundings, make sure it's safe to play and you do so yourself."
The police and City of Rockingham have been notified.
The City says they undertake regular inspections of their playgrounds.
Perth to Bunbury train service returns
Missing woman found safe and well
Community fed up with teenage hoons terrorising Halls Head oval
Southern suburbs electrician claims $1.8 million Lotto win
Works continue on Pinjarra's Munday Avenue extension
Halls Head support worker charged with historic child sex offences
Severe thunderstorm warning cancelled for Mandurah, Bunbury
Fortnightly red bin collections to remain in the City of Rockingham after council rejects motion
Rate rises on the way for Rockingham, Mandurah ratepayers