North Korea's claim that it has restarted production of plutonium was met with indignation from South Korea and a rebuke from Washington.
"If North Korea has produced plutonium as reported, it is violation of a U.N. Security Council resolution that bans all nuclear-related activities," Defense Ministry Spokesman Moon Sang-gyun told reporters in Seoul on Thursday.
He said the South Korean goverment would consult with others on a response.