North Korea says it has successfully tested a solid-fuel engine for its new-type intermediate-range hypersonic missile. It’s seen as claiming a progress in developing a more powerful, agile missile designed to strike faraway U.S. targets in the region. According to the official Korean Central News Agency (KCNA), leader Kim Jong Un oversaw the test on Tuesday, Mar. 19 at the Sohae Launch Site, a frequent venue for previous launches of missiles and satellites.