Mitsubishi Heavy Industries' headquarters in Tokyo
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Japan defence firm Mitsubishi Heavy in cyber attack

Japan's top weapons maker has confirmed it was the victim of a cyber attack reportedly targeting data on missiles, submarines and nuclear power plants.

Mitsubishi Heavy Industries (MHI) said viruses were found on more than 80 of its servers and computers last month.

The government said it was not aware of any leak of sensitive information.

Roland Buerk has more information.

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