Retail giant Amazon may have known about the danger of their hoverboards, as reported by PersonalInjury.com.

Recently a federal appellate court ruled Amazon knew the hoverboards, which are motorized skateboards, were catching fire and exploding. The Chinese pedaled hoverboards became popular during the 2015 holiday season.

Knoxnews.com reports a Nashville family at the center of the lawsuit says they experienced the toy catch fire, forcing their two children to jump from a second-story window and destroying the family’s $1 million home.

The court ruled Amazon “quietly” stopped hoverboard sales after its investigation showed proof of the fire danger. However, the retailer only sent a vaguely worded email about “news reports of safety issues”, rather than telling the 250,000 buyers who purchased the hoverboards of the true dangers.

Read more about the lawsuit on PersonalInjury.com and Knoxnews.com.