An unnamed spokesman for North Korea’s Academy of Defense Science said the successful outcome of the latest tests “will be applied to further bolster up the reliable strategic nuclear deterrent of the Democratic People’s Republic of Korea.”

The test possibly involved technologies to improve intercontinental ballistic missiles that could potentially reach the continental United States.

North Korea did not elaborate on Friday night’s seven-minute test at the Sohae Satellite Launch Site. It came six days after North Korea conducted what it called a “very important test” at the same location.