UNITED NATIONS (Reuters) - The U.N. Security Council on Friday urged North Korea not to carry out a planned nuclear-weapon test and warned Pyongyang of unspecified consequences if it did. The warning, in a formal statement adopted unanimously, came three days after North Korea's announced it planned its first underground nuclear test, saying its hand had been forced by a U.S. "threat of nuclear war and sanctions." U.S. officials have said the reclusive state might detonate a device as early as this weekend, and a Chinese source said Pyongyang planned to carry out the test deep inside an abandoned mine.