North Korea fired off a missile that flew at 10 times the speed of sound

North Korea test-fired a missile that the South Korean military assessed was more advanced than the one tested last week and hit a top speed of Mach 10, or ten times the speed of sound.

The South Korean Joint Chiefs of Staff said the weapon flew 435 miles before landing in the East Sea. The maximum altitude was 37 miles.

The South Korean military explained in a statement that it determined that this weapon was “more advanced than the ballistic missile launched on Jan. 5,” NK News reported.

Last week, North Korea tested a “hypersonic” weapon that the country claimed “precisely hit a set target 700 km away” and made a “120 km lateral movement” during flight, demonstrating “the control and stability of the hypersonic gliding warhead.”

South Korea’s defense ministry said that “the North’s claim about the missile’s capabilities, such as its operational range and lateral movement, appears to be exaggerated.”

Along with a statement, North Korea also released photos of the weapon tested on Jan. 5.