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Fans of Fidget Spinners have been warned by a number of American mums about exploding toys and the dangers of shoddy manufacturing.

Bluetooth Fidget Spinners, which connect with phones to play music through built-in speakers, have been found to explode and burst into flames while charging. Two mums have reported their kids’ gadgets unexpectedly went up in flames while charging, prompting fears they could be dangerous.

Kimberley Allums described the incident to WBRC, in footage you can watch below:

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The mother-of-two from Gardendale, Alabama, told WBRC:

"I was downstairs and all I heard was 'Fire, fire!' The fidget spinner wasn't smoking, it was in flames.

Allums said her family was just about to leave the house for the day when the device combusted, leaving scorch marks on the carpet.

The incident has sparked fears the Bluetooth devices have not passed safety standards and could be a risk to families and homes if left charging unattended.

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The worried mum concluded: "I just really want people to be aware of this because a lot of people have been inboxing me reaching out to me leaving messages saying my child has this same fidget spinner."

Mum Michelle Carr said her Bluetooth spinner also caught fire after just half-an-hour on charge, telling WEYI:

I personally won’t buy another one because of the fear of it. I know there are tons of kids who want to go get them, but if you plug them in, just stay by and make sure it's charged and doesn't catch.

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Fidget Spinners were designed as stress-relieving tools, which have been used to help kids deal with ADHD and anxiety, an users even report the tiny spinning gadgets have helped them stop nail-biting.

The Consumer Product Safety Commission told Gizmodo:

Never charge a product with batteries overnight while you are sleeping. Always follow the manufacturer's instructions and use the charger from the manufacturer that is designed specifically for your device.

Hopefully, when looked after carefully, the toys can carry on entertaining and helping kids everywhere, and irritating the hell out of everyone else to the users' hearts content.