Satellite images appear to show that North Korea has begun rebuilding a portion of a facility previously used to test long-range missile engines, analysts said Tuesday, raising potential questions about the future of US-North Korea negotiations.

The Center for Strategic Studies’ Beyond Parallel project and 38 North, both respected North Korea monitoring websites, each said it had observed activity at the Tongchang-ri satellite launch facility, which has been dormant since about August of last year…

38 North found that efforts to rebuild the site’s launch pad and missile engine test stand began sometime between February 16 and March 2, meaning work began either in the days before, during, or immediately after North Korean leader Kim Jong Un and US President Donald Trump abruptly ended their second summit in Hanoi on February 28 without signing a deal.