A three-year-old boy has died after sustaining injuries at a Toowoomba playground attraction.
The child was found unresponsive at Inflatable World Toowoomba on Sunday.
He was found at the bottom of a slide with injuries to the back of his head and taken to Toowoomba Hospital, police said.
He was transferred to Brisbane's Lady Cilento Children's Hospital where he died on Monday.
Police have appealed for anyone who may have witnessed the boy playing at the centre on Sunday to contact them.
Workplace Health and Safety are also investigating.
Inflatable World Toowoomba said in a post to their Facebook page on Monday: "We are devastated by the news that a child has passed away in hospital after collapsing at our venue on Sunday afternoon.
"Inflatable World notified Worksafe on Sunday and they began investigating.
"A full investigation involving all relevant authorities is underway, we have also undertaken our own internal investigation, are working with authorities and have passed on our findings.
"Inflatable World takes the health and safety of our patrons, staff and others very seriously while they are on our site and have taken extensive measures to ensure we have the highest standards for workplace safety.
"We offer our deepest condolences to the family."
AAP and staff reporters