A cyber alert has been issued by South Korea after government websites were allegedly hacked.
The presidential office site was one of a number said to have been targeted in a co-ordinated attack by unidentified hackers.
A Science Ministry statement read: "The government can confirm a cyber attack by unidentified hackers that shut down several sites including the Blue House (the presidential office)."
Messages hailing North Korean leader Kim Jong-un and claiming that hacking group Anonymous was responsible appeared on the targeted websites.
But Anonymous denied involvement on its Twitter feed.
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