Work at nuke site in N. Korea noted

WASHINGTON - Satellite imagery shows North Korea has made new tunnel entrances at its nuclear test site in a sign it is preparing to conduct more underground explosions there in the future, a U.S. research institute said Wednesday.

That’s the latest indication that Pyongyang is pressing on with its nuclear weapons program, although the U.S.-Korea Institute at Johns Hopkins School of Advanced International Studies says there’s no sign another test explosion is coming soon.

In February, North Korea conducted its third and most powerful nuclear test since 2006, drawing international condemnation and tighter U.N. sanctions. North Korea now says it is willing to resume aid-for-disarmament negotiations without preconditions, but the U.S. remains skeptical of Pyongyang’s intentions.

An analysis of recent commercial satellite imagery being published on the institute’s website, 38 North, concludes there are two new tunnel entrances at the Punggye-ri site in the country’s northeast, suggesting new tunnels are being constructed or new entrances for existing tunnels. There’s also enlarged heaps of soil from excavations and construction probably intended to upgrade support buildings.