North Korea resumes construction activity at nuclear test site: report

Debris is piled on the ground after Tunnel No. 2 of North Korea's only known nuclear test site in Punggye-ri was blown up, in this May 24, 2018, pool photo. Korea Times file

North Korea has recently resumed construction activity at an underground nuclear test site north of Pyongyang, which suggests a possible nuclear test down the road, a news report said Thursday, citing unidentified U.S. officials.

"North Korea has recently resumed digging tunnels and construction activities at its underground nuclear test site, according to five US officials," CNN reported.

The report comes after government sources in Seoul said the North may be working to create a shortcut to one of the underground tunnels at the Punggye-ri nuclear test site that it purportedly dismantled in 2018 in an internationally observed event to show its willingness to denuclearize.

One of the sources said the North had abruptly stopped its initial construction work to restore the entrance to an underground tunnel at Punggye-ri, and is now digging up a side of the tunnel apparently to create a shortcut to the tunnel.

The source added creating such a shortcut may allow the completion of restoration work "in a month."

Punggye-ri has been the site of all six of North Korea's known nuclear tests.

The work to restore the underground tunnels was detected earlier this year after Pyongyang said in January that it may consider restarting "all temporarily suspended activities," apparently referring to its self-imposed moratorium on nuclear weapons and long-range missile testing that had been in place since late 2017.

The North fired an intercontinental ballistic missile last Thursday (KST), ending its self-imposed restrictions on long-range missile testing.

In its annual Threat Assessment report, released earlier this month, the U.S. Office of the Director of National Intelligence said the North may be expected to resume nuclear weapons and ICBM testing this year. (Yonhap)