On Thursday, a wind gust in a primary school in Devonport, Tasmania, propelled a bouncy house about ten metres (32ft) in the air while kids were inside. Kids were celebrating the last day of the school year.
Two boys and two girls in year six died after they fell, and five others were injured.
Tasmania Police Commander Debbie Williams described the scene as “very confronting and distressing”.
She said in a statement: “It appears a wind gust caused the castle to lift into the air.”
“This is a very tragic event, and our thoughts are with the families and the wider school community, and also our first responders.
“Counselling is being made available to the families affected by this in the school community along with the first responders.”
ABC reporter Monte Bovill tweeted that locals “have been running to the school to collect their children”.
Police and emergency services were alerted to a severe incident at Hillcrest primary school in Devonport around 10am local time on Thursday.
Several rescue helicopters transported the children while police units and multiple ambulance crews were at the scene.
Scott Morrison, the Australian Prime Minister, said: “The events that occurred today in Devonport in Tasmania are just shattering.
“They are just unthinkably heartbreaking.
“Young children on a fun day out, together with their families, and it turns to such horrific tragedy, at this time of year, it just breaks your heart.
“I just want to say, to the parents and families and friends, all who were there, to the other young children there, I just pray you’ll have great family around you and great friends, and you can come through this horrific tragedy.”
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Accidents involving bouncy castles have occurred in the past.
A year earlier, a girl died in the UK after being thrown from a bouncy castle that eyewitnesses say exploded on a Norfolk beach.