North Korea conducted “another important test” of a reconnaissance satellite system, state-run media said Sunday, a day after Japan, South Korea and the U.S. reported an apparent ballistic missile launch by the country — the second such launch in a week.

The nuclear-armed country’s National Aerospace Development Administration and its Academy of Defense Science “conducted another important test on Saturday under the plan of developing a reconnaissance satellite,” the official Korean Central News Agency reported.

“Through the test, the NADA confirmed the reliability of (the) data transmission and reception system of the satellite, its control command system and various ground-based control systems,” KCNA said.