North Korea has threatened strikes on US military bases in Guam and Japan.
Military tensions on the Korean peninsula are at their highest level for years, with Pyongyang irate at the use of nuclear-capable US B-52 bombers and nuclear submarines in ongoing joint military drills with South Korea.
A North Korean army spokesman says the US should not forget that the Andersen base on Guam and naval bases on the Japan mainland and Okinawa, are all within the range of its precision target assets.
North Korea has successfully tested medium-range missiles that can reach Japan, but has no proven long-range missile capability that would allow it to hit targets on the US mainland or Guam - more than 3,000 kilometres away.
Guam's Delegate Madeleine Bordallo says the threat is unhelpful towards ensuring peace and security in the Asia-Pacific region.
She says the statements are a reminder of the importance of the Obama Administration's refocus on strengthening its defenses in the Asia-Pacific region.
Ms Bordallo says she remains confident in the nation's defense capabilities in protecting the United States and Guam from any threats or attacks.
In the CNMI, the Inos administration says it is keeping a close eye on the threat.