An Aug. 31 image from DigitalGlobe shows the 5-megawatt reactor at North Korea's Yongbyon facility. South Korean officials say they have confirmed that the nuclear reactor has been restarted. DigitalGlobe/ScapeWare3d/via Getty Images hide caption

itoggle caption DigitalGlobe/ScapeWare3d/via Getty Images

South Korean Cho Jang-geum, 81, weeps as she fills out an application to reunite with family members who live in North Korea, at the headquarters of the Korean Red Cross in Seoul Saturday. North Korea announced today that it is indefinitely postponing the reunions of families who were separated by the 1950-53 Korean War. The meetings were to take place in the coming week. Park Dong-ju/AP hide caption

itoggle caption Park Dong-ju/AP

This is a DigitalGlobe image of the 5-megawatt (electric) reactor at North Korea's Yongbyon facility, Aug. 31, with steam seen coming from the electrical power generation building. DigitalGlobe/ScapeWare3d/via Getty Images hide caption

itoggle caption DigitalGlobe/ScapeWare3d/via Getty Images

Former basketball star Dennis Rodman at Beijing Capital International Airport on Tuesday, before his flight to Pyongyang, North Korea. Petar Kujundzic /Reuters /Landov hide caption

itoggle caption Petar Kujundzic /Reuters /Landov

Spanish aristocrat Alejandro Cao de Benos is believed to be the only foreigner working for the North Korean government. He divides his time between North Korea and Europe, where he organizes university conferences on North Korean ideology. He's shown here with a North Korean military officer in Panmunjon, on the border with South Korea. Courtesy of Alejandro Cao de Benos hide caption

itoggle caption Courtesy of Alejandro Cao de Benos

Delegates from South Korea (left) and North Korea wrap up a working-group meeting in the border village of Panmunjom in advance of talks that were scheduled for Wednesday in Seoul. South Korean Unification Ministry/AP hide caption

itoggle caption South Korean Unification Ministry/AP