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North Korea expands work at nuclear test site to second tunnel, report says
North Korea appears to be expanding work at its nuclear test site to include a second tunnel, a US-based think tank said on Thursday, as South Korean and US officials say North Korea might conduct a nuclear test any day.
Preparation work at the Punggye-ri Nuclear Test Facility's Tunnel No. 3 was apparently complete and ready for a possible nuclear test, the Center for Strategic and International Studies said in a report, citing commercial satellite imagery.
North Korea conducted six underground nuclear tests at the site from 2006 to 2017.
