This technology can later use to create an Intercontinental missile capable of reaching the US West coast.
The officials told Reuters they believed the test could be part of Pyongyang's programme to develop an inter-continental ballistic missile.
Citing unnamed US officials, Reuters reports that Pyongyang may have been testing the last stage engine of an ICBM.
The news of another rocket engine test by Pyongyang comes as an United States official said on Wednesday there were signs of increased activity at North Korea's lone nuclear test site.
The North has carried out two atomic tests and dozens of missile launches since the beginning of previous year in its quest to develop a missile capable of delivering a nuclear warhead to the continental United States - something Trump has vowed "won't happen".
It can be used to build Intercontinental ballistic missiles.
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South Korean President Moon Jae-in, who was elected last month on a platform of a more moderate approach to Pyongyang including dialogue to ease tension, inspected the test-launch of a ballistic missile on Friday that is being developed by the South's military.
On March 18th, North Korean media reported that leader Kim Jong-un observed a successful testing of a homegrown ICBM engine.
China's top diplomat met Trump at the White House on Thursday, where he said Beijing was willing to keep working with Washington to defuse tensions on the Korean peninsula, China's foreign ministry said. In September 2016, Pyongyang carried out another nuclear test, while more than 20 missiles were test-fired during the year.
Any military solution to the North Korea crisis would be "tragic on an unbelievable scale", Trump's defense secretary, Jim Mattis, said last month.
But a test on June 21 of a new capability being developed by the US and Japan to defend against shorter-range missiles failed to hit its target, the US Missile Defence Agency said on Thursday.
In March after North Korea conducted three rocket engine tests.