North Korea's declaration they would undertake a nuclear test and more long-range rocket launches follows the United Nations Security Council's condemnation of the country on Tuesday.
The UN expanded sanctions against the regime for launching a rocket in December.
North Korea said the launch was a peaceful satellite mission, but the US and others said it was a test of long-range missile technology.
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Early low cloud will gradually retreat to North Sea coasts to leave many with a fine day, particularly in the west.