This past Friday, Apple said that, in all cases, the iPhones in question were damaged by an "external force," not a faulty battery or glass screen:
"To date, there are no confirmed battery overheating incidents for iPhone 3GS and the number of reports we are investigating is in the single digits. The iPhones with broken glass that we have analyzed to date show that in all cases the glass cracked due to an external force that was applied to the iPhone."It does seem odd that at least four cases have been reported in France in short order. Still, it's even stranger that iPhones would suddenly turn into Molotov cocktails. We'll keep you updated on this story.