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It has unleashed a torrent of threats against Seoul and Washington since punishing U.N. sanctions were imposed for Pyongyang’s Feb. 12 nuclear test. It calls ongoing routine U.S.-South Korean military drills a threat to its existence. Pyongyang also threatened revenge after blaming Seoul and Washington for a separate Internet shutdown that disrupted its own network last week.

Seoul alleges six previous cyberattacks by North Korea on South Korean targets since 2009.

Wednesday’s cyberattack did not affect South Korea’s government, military or infrastructure, and there were no initial reports that customers’ bank records were compromised. But it disabled cash machines and disrupted commerce.

All three of the banks that were hit were back online and operating regularly Friday. It could be next week before the broadcasters’ systems have fully recovered, though they said their programming was never affected.