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Suspected North Korea missile test hit speed of Mach 10, more advanced than previous test, Seoul says
Tuesday's projectile was launched from Jangang province, near the North Korean border with China and landed in the ocean between the Korean Peninsula and Japan, its flight covering a distance of more than 700 kilometers (435 miles) and reaching a height of 60 kilometers (37 miles), the statement said.
Assessment of the test by South Korean and United States intelligence was ongoing, but initial analysis showed Tuesday's test, in which the projectile reached a speed of Mach 10 was of a more advanced weapon than the test North Korea conducted last Thursday, the South Korean Joint Chiefs said.
That test was of what North Korean state media claimed was a hypersonic missile, the second alleged test of such a weapon by the Kim Jong Un regime [cnn.com]. However, many experts doubted this claim [cnn.com].
A hypersonic missile actually refers to the payload that a rocket carries aloft. In this case, that payload could be what is called a hypersonic glide vehicle (HGV).