The concern is that the prongs of the charger might break off inside the power socket -- obviously a risk for electrical shocks.
Apple has determined that under certain conditions the new ultra compact Apple USB power adapter's metal prongs can break off and remain in a power outlet, creating a risk of electric shock. We have received reports of detached blades involving a very small percentage of the adapters sold, but no injuries have been reported.
It seems that the power adapters shipped along the Indian iPhone 3G are not affected since we use rounded pins and not the flat pins that the recall is meant for If you are from the US, Japan, Canada, Mexico, or several Latin American countries, head here to learn more about the issue and how to take part in the recall program.
Source: Techtree.com
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