BERLIN—There are signs that North Korea is still enriching uranium, which could potentially be used in a nuclear weapon, the U.N.’s atomic watchdog said Wednesday.

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. AP Photo/APTN, File
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