North Korean leader Kim Jong Un has lauded the country's nuclear scientists and technicians behind its sixth nuclear test last week — purportedly of a hydrogen bomb — with a banquet and other events, urging them to continue their work building what state media on Sunday called "the strongest nuclear bombs in the world."
There was no specific date for the events, but they were believed to have been held Saturday, as the isolated country marked its foundation day.
Though no launches were detected on the anniversary, South Korea, Japan and the United States remained on high alert for a fresh missile test. Seoul had warned earlier last week that Pyongyang might fire a long-range missile to mark the anniversary.