SEOUL, South Korea - North Korea vowed today to enlarge its atomic arsenal and warned of a "fire shower of nuclear retaliation" in the event of a U.S. attack, as the regime marked the 1950 outbreak of the Korean War.

The anniversary came as the U.S. Navy trailed a North Korean ship suspected of carrying weapons in violation of a U.N. resolution punishing Pyongyang's May 25 nuclear test, and as anticipation mounted that the North might test-fire short- or mid-range missiles in the coming days.

President Barack Obama extended U.S. economic sanctions against North Korea for another year Wednesday, saying the North's possession of "weapons-usable fissile material" and its proliferation risk "continue to pose an unusual and extraordinary threat" to the United States, according to the White House Web site.

Recommended for you

(0) comments

Welcome to the discussion.

Keep it Clean. Please avoid obscene, vulgar, lewd, racist or sexually-oriented language.
PLEASE TURN OFF YOUR CAPS LOCK.
Don't Threaten. Threats of harming another person will not be tolerated.
Be Truthful. Don't knowingly lie about anyone or anything.
Be Nice. No racism, sexism or any sort of -ism that is degrading to another person.
Be Proactive. Use the 'Report' link on each comment to let us know of abusive posts.
Share with Us. We'd love to hear eyewitness accounts, the history behind an article.