North Korea has a secret long-range missile base near the Chinese border, a report from the Washington-based Center for Strategic and International Studies revealed Wednesday. In this 2022 photo, North Korean leader Kim Jong Un walks in front of a nuclear-capable ICBM. File Photo by KCNA/UPI | License Photo

SEOUL, Aug. 21 (UPI) -- North Korea has constructed a secret military base near the Chinese border to hold intercontinental ballistic missiles that pose a "potential nuclear threat" to the United States, a report by the Washington-based Center for Strategic and International Studies said.

Beyond Parallel, a Korea-focused project of CSIS, revealed the Sinpung-dong Missile Operating Base in North Pyongan Province on Wednesday, based on an analysis of commercial satellite imagery. The North has never declared its existence.

The fortified underground base is located around 17 miles from the Chinese border in Taegwan County, the think tank said in a report posted on its website.

It likely houses a brigade-sized unit with a total of six to nine nuclear-capable ICBMs and their mobile launchers, CSIS analysts said.