Posted on March 6, 2019
The images were taken two days after talks between the leaders of the US and North Korea ended without them reaching a deal on denuclearisation.
The Tongchang-ri site has been used for satellite launches and engine testing, never for ballistic missile launches.
Work to dismantle it began last year but stopped as the US talks stalled.
The pledge to dismantle it had been seen as a confidence-building measure between Pyongyang and Washington.
Meanwhile, the US has warned North Korea could face yet more sanctions should Pyongyang not take steps to denuclearise.