This week's headlines uncovered gruesome mass graves and migrant prison camps in the northern part of the country. It shocked the nation and prompted responses from the authorities to investigate and tighten the porous borders. We speak to the journalist that broke the story of the controversial prison camps. How did he discover it and what were the string of clues that followed?

This is a report by Aisyah Tajuddin, Aziff Azuddin and Sharyl Kaur.