USB cord caught on fire while charging. Headphones toasted?

USB cord caught on fire while charging. Headphones toasted?
I think I learned a lesson the other day: Do not charge Beats headphones in the car. We took a 20 hour drive, and while I was not driving, I listened to the XM radio via my Beats Studio Headphones. When they needed to be charged, I plugged them into a car adapter. Then I picked up the headphones to move them, and the cord was ON FIRE!!

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