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It looks like Japan’s current implementation of their J-Alert system can start warning citizen about 2 seconds after the info is automatically received by the system. It warns them via nationwide loudspeakers, TV, radio, email, and cell phones. So they’ve got their bases covered, so to speak. They may be able to turn off alerts on their phone (the article doesn’t say), but probably not on anything else. Definitely not the loudspeakers.