TOKYO - Japan investigates the reason for the defect in Apple Inc.’s iPod after the emission of spark while recharging the digital music players, said a government official.

The reason for Japanese government conducting the investigation is to find out the cause why an Apple iPod nano gets overheated and emit sparks while being recharged.

An official at the trade and economy ministry, which administer the product problems, said a defect is suspected in the lithium-ion battery of the iPod Nano, model number MA099J/A.

The ministry has asked Apple Japan to investigate the cause of the incident. “It is suspected that the incident happened by the product itself,” said the official at the trade and economy ministry.

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