"A local government inquiry found that the mobile phone battery had exploded due to the heat of the iron mill. Lithium batteries are widely used in mobile phones - but if they are overcharged or exposed to heat, the inflammable liquid inside can explode."

There's the meat of the story....
Moral is, stay out of very hot places with things that willl explode when you expose them to very hot places rofl
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You know something bad is going to happen when you hear..."Hey, hold my beer and watch this"