Pyongyang tested a new rocket engine that can be installed on an intercontinental ballistic missile (ICBM), Fox News reported on Thursday, citing unnamed US officials.

According to the channel’s sources, the test took place on Wednesday. Pyongyang conducted similar tests in March.

Another US official was quoted as saying that increased activity was detected at North Korea’s sole nuclear test site in recent days.

“There are more people and more cars but nobody knows what that means,” the official said.

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