Fitbit failed to report overheating incidents involving its Ionic watches in which customers suffered serious burns, safety regulator said.

The Consumer Product Safety Commission said Thursday that Fitbit knew a defect in its Ionic smartwatches created an unreasonable risk of serious injury or death, as it had received numerous reports of the devices overheating while being worn and leaving some consumers with second- and third-degree burns.

Fitbit will pay more than $12 million for failing to promptly report that its Ionic smartwatches posed serious burn risks, officials said.Fitbit LLC, which is now owned by Google, has been fined $12.25 million to settle claims by the