<p>They said the tunnels were being dug at the nuclear site in North Hamgyong province where previous plutonium-fuelled tests were conducted in 2006 and 2009, Yonhap News Agency reported.<br /><br />"South Korea and US intelligence authorities have spotted the North building a couple of additional tunnels in Punggye-ri," it quoted a government official as saying. "It's obvious that North Korea is preparing for a third nuclear test."<br /><br />The source gave no further details on how many tunnels were being constructed.<br /><br />The South Korean military is monitoring movements in the North to determine whether Pyongyang will conduct nuclear tests and long-range missile tests at the same time, Yonhap said.</p>.<p>Reports said North Korea had completed a new missile launch site on its western coast near the Chinese border.<br /><br />Pyongyang conducted long-range missile tests in 1998, 2006 and 2009, which were said to be partial successes.<br /><br />"We are closely watching its new missile launch site in Dongchang-ri and the Punggye-ri nuclear test site," the agency quoted a military source as saying. </p>
<p>They said the tunnels were being dug at the nuclear site in North Hamgyong province where previous plutonium-fuelled tests were conducted in 2006 and 2009, Yonhap News Agency reported.<br /><br />"South Korea and US intelligence authorities have spotted the North building a couple of additional tunnels in Punggye-ri," it quoted a government official as saying. "It's obvious that North Korea is preparing for a third nuclear test."<br /><br />The source gave no further details on how many tunnels were being constructed.<br /><br />The South Korean military is monitoring movements in the North to determine whether Pyongyang will conduct nuclear tests and long-range missile tests at the same time, Yonhap said.</p>.<p>Reports said North Korea had completed a new missile launch site on its western coast near the Chinese border.<br /><br />Pyongyang conducted long-range missile tests in 1998, 2006 and 2009, which were said to be partial successes.<br /><br />"We are closely watching its new missile launch site in Dongchang-ri and the Punggye-ri nuclear test site," the agency quoted a military source as saying. </p>