Several grade 6 children fell from a height of 10 metres, causing serious injuries, when wind blew the jumping castle into the air at Hillcrest Primary School in Devonport, in the state's north-west.
Five children are in hospital, four of them critically injured.
"These children were meant to be celebrating their last day of primary school, instead we're all mourning their loss," Tasmania Police Commissioner Darren Hine said this afternoon.
