Nike's website has been hijacked by a protest group.
The sports giant's web presence redirected visitors to web pages advertising a Melbourne organisation called s11.
The group claimed to be organising protests at the meeting of the World Economic Forum in Melbourne this September.
Nike said new security measures would stop similar incidents in the future.
This was not the first time big names have been hit by political groups.
In April Serb hackers broke into the websites of 50 organisations including Manchester United and Adidas.
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