https://www.reuters.com/article/us-usa-northkorea-missiles-engine-idUSKBN19D2RC
By Phil Stewart | WASHINGTON
North Korea has carried out another test of a rocket engine that the United States believes could be part of its program to develop an intercontinental ballistic missile, a U.S. official told Reuters on Thursday.
The United States assessed that the test, the latest in a series of engine and missile trials this year, could be for the smallest stage of an intercontinental ballistic missile (ICBM) rocket engine, said the official, who spoke on the condition of anonymity.