TOKYO — Japan could soon run out of its most popular beer, after a devastating cyberattack on its biggest brewer that has brought its domestic factories to a halt. Asahi Group, the Tokyo-based maker of Asahi Super Dry, said Monday that it was experiencing a “system failure” caused by the cyberattack, which disabled order and shipment operations at most of its 30 Japanese factories. Overseas sites do not appear to be affected by the cyberattack.

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