What to know about North Korea's unveiling of its uranium enrichment facility

In a significant show of defiance against the United States, North Korea on Friday provided a rare view into a secretive facility built to enrich uranium for nuclear bombs as leader Kim Jong Un called for a rapid expansion of his nuclear weapons program. North Korea’s official Rodong Sinmum newspaper published several photos showing Kim talking with scientists and military officials in a hall tightly packed with gray centrifuge tubes that were about the height of his shoulders. The North didn’t specify where the facility is located or when Kim went there. Experts say the North Korean photos likely disclosed a centrifuge room at one of its two known plants in the towns of Yongbyon and Kangson, both near Pyongyang.