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North Korea is testing hypersonic weapons. Should the West be worried?
By Scott Neuman
Early warning systems first suggested North Korean missile could hit US, causing temporary scramble
By Katie Bo Lillis, Barbara Starr & Oren Liebermann
North Korea tests suspected ballistic missiles for 4th time in a month
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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