UPDATE: Detectives are yet to determine how a boy who suffered serious head injuries at an indoor Toowoomba pla ground died.
The toddler, 3, who died in a Brisbane hospital on Monday was found in a "distressed state" in the under 5s section of Inflatable World Toowoomba,
Despite appeals for witnesses of adults and children in the area at the time, detectives said they have yet to be contacted by anyone but have reviewed CCTV footage of the incident.
It is understood a post-mortem examination will be carried out in Brisbane tomorrow.
Detectives again urged anyone who may know anything about the incident to contact them.
EARLIER: Tributes are flowing for the three-year-old boy who died after sustaining an injury to his head at Inflatable World Toowoomba.
What should have been a fun day out with his grandparents, turned into heartbreak.
The Gold Coast toddler was found convulsing at the bottom of one of the inflatable sides about 1pm on Sunday.
The three-year-old boy was taken to Toowoomba Hospital and later airlifted to Brisbane's Lady Cilento Children's Hospital where his life support was turned off about noon Monday.
After sharing the story on The Chronicle Facebook page, more than 300 people offered their condolences to the young boy and family.
Melissa Biscaya said it was such a sad story.
"I feel very sorry for the family of the child. I have been there a few times with my four year old and we always have fun together. Condolences to the family," she said.
Jen Shipston said she was devastated.
"I'm so sorry for their loss. Breaks my heart, my kids love it there and it could happen quickly I'm sure. I have three kids so I know how easily something like this could happen. RIP little guy," she said.
Leanne Jago offered her condolences.
"May he rest in peace. Thoughts with the centre staff as they cope with this tragedy as well. May all be able to access the help they need," she said.
Kate Kinsella said "So devastating for the family and my best wishes to the staff, it can't be an easy time for them. Hope they have access to counselling if they need it."
Other people have raised their concerns about the safety of their own children at the indoor play centre.
Kat Waters said "I have never taken my children there but there seems to be a lot of accidents in this business not sure what's going on but something needs to be done now."
Rebecca Crofts said at Inflatable World you had to keep an eye on your children at all times.
"We went not long ago for the first time, you really need to supervise your own children. There are too many for staff keep a eye on," she said.
Lee Anderson said people shouldn't lay blame on the staff.
"It is disturbing how everyone has tried and are ready to execute a local business without having any idea of what actually happened to the poor child," she said.
If anyone was around the Under-5s section on Sunday, particularly parents or adults that may have seen the child is asked to talk to police.
EARLIER: Detectives investigating the death of a boy following an incident at a Toowoomba indoor playground are urging witnesses to come forward.
A Gold Coast toddler died in hospital on Monday after he was found "in a distressed state" at the base of a slide at Inflatable World about 1pm Sunday.
The three-year-old boy from Coomera was taken to Toowoomba Hospital and later airlifted to Brisbane's Lady Cilento Children's Hospital where his life support was turned off about noon Monday.
Child Protection Investigation Unit Detective Sergeant Brent Parker said the toddler's death was not being treated as suspicious, but the circumstances surrounding the incident needed to be investigated.
"There's nothing there to suggest it was suspicious, but it is our job to try and work out what happened," he said.
"The investigation will be a co-ordinated effort with Workplace Health and Safety."
Det. Sgt Parker said the three-year-old Gold Coast boy was found "in a distressed state" near the bottom of an inflatable slide on Sunday.
Witnesses and bystanders said the boy was conscious when he was located, and police had spoken with a number of people there at the time.
Det. Sgt Parker urged any parents with children at the play centre around 1pm Sunday to contact detectives.
"If anyone was around the Under-5s section, particularly parents or adults that may have seen the child is asked to talk to police," he said.
EARLIER: Police are investigating the death of a three-year-old boy who was found unresponsive at Inflatable World Toowoomba.
On Sunday at 1pm the toddler was found unresponsive lying beside one of the inflatable objects.
The boy from Coomera was attending the indoor play centre with a family member when the incident occurred.
The boy was transported to the Toowoomba Hospital where he was then transported to the Lady Cilento Children's Hospital in Brisbane.
His life support was turned off yesterday about noon.
Workplace Health and Safety Queensland will investigate the incident and police will prepare a report for the coroner.
Detectives would like to speak to anyone who saw a boy wearing dark clothing at the centre.
A spokeswoman from Inflatable World said centre staff were devastated.
"We are devastated by the news that a child has passed away in hospital after collapsing at our venue on Sunday afternoon," she said.
"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. At this stage, we cannot comment further on the matter."