The Pentagon announces it will increase the number if interceptors in its West Coast missile defense system by 14. Thirty are already in place, 26at Fort GreeleyAlaska and 4 at Vandenberg AFB in California.
The defensive military action comes after North Korea tested an underground nuclear device launched a small satellite into orbit for the first time and displayed what US intelligence believes may be a road-mobile ballistic missile.
Experts say a complex detection system ofsatellites and radarwould detect an enemy missile and launch an interceptor if needed.
The increase in defenseaims to protect the US as well as its NE Asia allies.