20 March 2013 Last updated at 22:06 ET
A cyber attack on a South Korean bank came from an internet address in China, South Korean officials say.
The South's telecom regulator said hackers used a Chinese address to plant malicious code that shut down Nonghyup bank's network on Wednesday.
Another bank and three TV stations were also targeted on the same day.
Initial reports suggested the attack could have come from North Korea, which has been blamed for similar attacks in 2009 and 2011.

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