A U.S. expert says that North Korea may have more secret uranium enrichment facilities. Robert Einhorn, a former special adviser for nonproliferation and arms control at the U.S. State Department, told the Voice of America on Sunday that the North may have more uranium enrichment plants besides the one in Yongbyon. Experts in China believe that Pyongyang has 20 nuclear warheads, but unlike the information on plutonium-based nuclear arms, it's difficult to get a grasp of uranium enrichment capabilities. Victor Cha, the Korea chair at the Washington-based Center for Strategic and International Studies, also told VOA that North Korea is downplaying its nuclear program and that its uranium enrichment is a serious issue. ▶ 기사 원문 : http://www.ytn.co.kr/_pn/1207_2015042... ▶ 제보 안내 : http://goo.gl/gEvsAL, 모바일앱, [email protected], #2424 ▣ YTN 유튜브 채널 구독 : http://goo.gl/Ytb5SZ [ 한국 뉴스 채널 와이티엔 / Korea News Channel YTN ]