The South Korean intelligence report says it is highly probable that after the long-range rocket launch, North Korea will use the ensuing international condemnation as an excuse to go ahead with the nuclear test in Punggye-ri, the site in the country’s northeast where the other two tests were conducted in 2006 and 2009.

The report, which said such a test would be considered a grave provocation, includes satellite images that it claims were filmed recently and show the final stages of a tunnel being dug at the site.

The photos show an unusual pile of earth and sand near the opening of the tunnel, and the report says this pile has been slowly increasing since March.