North Korea has carried out its sixth and most advanced nuclear test yet, claiming to have tested a hydrogen bomb that is small enough to be mounted on a long-range missile. It is certain to provoke international condemnation. The test, which happened at 12 p.m. local time on Sunday, was carried out at the Punggye-ri nuclear test site in North Hamgyong province, which is where all five of the country's previous nuclear tests have also taken place. The test came just hours after North Korea claimed to have succeeded in developing a miniaturized hydrogen bomb, a significant development if proven to be true. North Korea's Nuclear Weapons Institute said it had successfully tested the miniaturized device during Sunday's test. "The H-bomb test was carried out to examine and confirm the accuracy and credibility of the power control technology and internal structural design newly introduced into manufacturing H-bomb to be placed at the payload of the ICBM (intercontinental ballistic missile," the institute said.