Two B-1B Lancer strategic bombers on Thursday conducted drills on the western coast of the Korean peninsula, a South Korean military officer confirmed to NK News.

The bombers were dispatched from Andersen Air Force Base in Guam and flew over the Korean peninsula, reportedly staging simulated bombing drills while flying in formation with around 20 aircraft participating in the annual “Vigilant Ace” air combat drill.

U.S. stealth fighter jets were not mobilized in Thursday’s exercise, the military said, which saw the two strategic bombers enter the Korea Air Defense Identification Zone (KADIZ), fly to Jeju island and up the west