North Korea may soon open a large COVID-19 disinfection zone near its border with China to resume cross-border trade via rail, South Korea’s National Intelligence Service (NIS) claimed Thursday, as NK Pro analysis of satellite imagery shows fresh activity at the zone.

Planet Labs satellite imagery from October shows an increase in activity at the site near the large border city of Sinuiju, though it is unclear if the movement of vehicles and materials around the sprawling zone means it’s already taking shipments from China or still preparing for opening.

The NIS reportedly