North Korea has warned it could carry out a nuclear test if demands for aid are not met, US officials said. The threat was allegedly made on Thursday on the sidelines of six-nation talks between the US, the two Koreas, China, Russia and Japan. Unnamed US officials said Pyongyang had made similar threats before, and that the talks had still been useful. A nuclear test by North Korea would add to regional unease and pressure its neighbours to join a nuclear arms race. The warning about a possible nuclear test came during one-to-one talks between James Kelly, the US negotiator, and his North Korean counterpart Kim Kye-gwan. Full Story