(CNN) Satellite images appear to show North Korea is shuttering its nuclear test site, according to analysts from North Korean monitoring site 38 North.

Analysis published Monday claims photographs taken May 7 show some of the buildings at the site have been razed. Some rails for the mining carts, which are needed to dig tunnels, have also been removed, the 38 North piece claims.

Some key facilities remain intact and the tunnel entrances remain open, however. The authors speculate that may be because they'll be blown up in front of members of the international media later this month.

Satellite imagery from Digital Globe and 38 North no activity at the Command Center support area of North Korea's Punggye-ri nuclear test site.

North Korea's Foreign Ministry announced over the weekend it would invite journalists to watch the site's shuttering as early as May 23.

The 38 North analysis was written by a former International Atomic Energy Agency nuclear chief inspector and long-time North Korea defense analyst.

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