(AP) Investigators have traced a coordinated cyberattack that paralyzed tens of thousands of computers at six South Korean banks and media companies to a Chinese Internet Protocol address, but it was not yet clear who orchestrated the attack, authorities in Seoul said Thursday.

The discovery did not erase suspicions that North Korea was to blame. IP addresses are unique to each computer connected to the Internet, but they can easily be manipulated by hackers operating anywhere in the world. The investigation into Wednesday’s attack could take weeks.

By Thursday, only one of the six targets, Shinhan Bank, was back online and operating regularly. It could be next week before the other companies have fully recovered.

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