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Early warning systems first suggested North Korean missile could hit US, causing temporary scramble
By Katie Bo Lillis, Barbara Starr & Oren Liebermann
North Korea is testing hypersonic weapons. Should the West be worried?
By Scott Neuman
North Korea fires railway-borne missiles as US tension rises
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North Korea says it fired two missiles from railway car
By Yoonjung Seo, Gawon Bae & Brad Lendon
North Korea conducts a fourth presumed missile test in a month
By Junko Ogura & Gawon Bae