Worm affects Iran nuclear plant

A complex computer worm has infected the personal computers of staff at Iran's first nuclear power station, says the IRNA news agency.

However, the operating system at the Bushehr plant - due to go online in a few weeks - has not been harmed, project manager Mahmoud Jafari said.

The Stuxnet worm is capable of seizing control of industrial plants.

Sian John is a security expert with the US-based internet security firm Symantec. She explained how the it operates.

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