The United States said Monday that it was trying to determine the authenticity of North Korea's claim that it conducted a second nuclear test just hours earlier, according to Yonhap News. "We are aware of the reports of a nuclear test by North Korea," a State Department official said, requesting anonymity. "We are consulting with our allies. Once we have established the facts, we will have more to say. At this point, I do not have a timeline as to when there will be more to say." North Korea said it conducted an underground nuclear test Monday morning (Seoul time)...