FILE – In this June 27, 2008 file photo from television, the 60-foot-tall cooling tower is seen before its demolition at the main Nyongbyon reactor complex in Nyongbyon, also known as Yongbyon, North Korea. North Korea vowed Tuesday, April 2, 2013, to restart a nuclear reactor that can make one bomb’s worth of plutonium a year, escalating tensions already raised by near daily warlike threats against the United States and South Korea. The North’s plutonium reactor was shut down in 2007 as part of international nuclear disarmament talks that have since stalled. The declaration of a resumption of plutonium production — the most common fuel in nuclear weapons — and other facilities at the main Nyongbyon nuclear complex will boost fears in Washington and among its allies about North Korea’s timetable for building a nuclear-tipped missile that can reach the United States, technology it is not currently believed to have. (AP Photo/APTN, File)