Two children were tossed across a field inside a bouncy castle after it detached from the ground and carried them away.
Horrified onlookers saw the inflatable travel around 300 feet (91 metres) across Robert A Easton Park in Jefferson County, Colorado, on Saturday.
One child was hospitalised and the other was treated at the scene, the West Metro Fire Protection District told Fox 31 Denver.
Witness Vanessa Atencio told Good Morning America: "We saw the wind kicking up and all of a sudden the wind took the jumpy slide with it and we were just horrified."
The accident is being investigated.
However, it is not the first time a bouncy castle has caused injuries. Earlier this month two boys were seriously injured, and a little girl left with cuts and bruises, after the bouncy castle they were playing in was lifted 50 feet (15 metres) into the air by a gust of wind in South Glens Falls, New York.
Witnesses said the boys fell from the inflatable when it was around 15 feet (4 metres) above the ground.