A Seoul-based NGO has spent the last two years attempting to identify key locations where human rights abuses are claimed to have taken place in North Korea in an effort to seek accountability for those responsible, according to a new report published on Wednesday.

The report, published by the Transitional Justice Working Group (TJWG), is a preliminary effort to “build a digital map of crimes against humanity in North Korea”, a press release accompanying the report read.

According to the report, TJWG interviewed 375 North Korean defectors over a two year period, cross referencing testimony with other data sources including satellite