North Koreans have made nuclear progress, experts say

The U.S. intelligence community believes North Korea tested a nuclear device last month with an explosive yield of several kilotons, considerably more powerful than its first test nearly three years ago. David Albright of the Ploughshares-funded Institute for Science and International Security said the test shows that the North Koreans are "pushing their program along" and that they have "made progress." A U.S. official said last week that there are indications the North Koreans "may be preparing" for another nuclear test. Albright said further testing could "significantly advance [North Korea's] nuclear weapons craft."