SEOUL, South Korea (AP) — The Pentagon is calling North Korea’s nuclear test “yet another flagrant violation” of U.N. Security Council resolutions as well as a “serious provocation.”

Pentagon press secretary Peter Cook is traveling Friday in Norway with U.S. Defense Secretary Ash Carter. In a statement, Cook says Carter has been briefed on reports of seismic activity near a North Korea nuclear site. Cook says Carter will remain in close contact with America’s South Korean allies as well as others friends and allies in the region.

Cook says a nuclear test would pose “a significant threat to the peace and security of the Korean peninsula and the stability of the Asia-Pacific region.”

North Korea confirmed Friday it had tested a nuclear warhead designed to be mounted on ballistic missiles.

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