South Korea's intelligence agency confirmed reports of increased activity at North Korea's nuclear reactor, possibly indicating a shutdown, a South Korean daily said on Wednesday.
The report came after a United States official said Washington had not seen any sign that North Korea has begun to shut down its Yongbyon nuclear facility as called for in a February 13 six-country agreement.
The Dong-A Ilbo newspaper said the National Intelligence Service had confirmed its report on Tuesday quoting unnamed intelligence sources as saying satellite photographs showed increased vehicle and personnel movements near Yongbyon.
A spokesman for the agency was not immediately available for comment.
A US official said on Tuesday that news reports in South Korean media are "just not accurate ... We have seen no actions on the North Koreans' part that at this point leads us to believe they are fulfilling their part of the 60-day actions."
North Korea was required to start closing the reactor and source of its weapons-grade plutonium by April 14, as well as allow U.N. nuclear inspectors back into the secretive country, as part of a deal it reached at the six-way talks in February.