Kuala Lumpur, May 29 (Euronews) -– Malaysia’s deputy home minister says 139 uncovered graves, which are believed to contain the corpses of trafficked migrants, appear to hold one body each.

Officials had expected to find mass graves on the site in Wang Kelian, at the Malaysia-Thailand border. The Malaysian Anti-Corruption Commission and police have since arrested two police officials suspected of involvement in transporting migrants, specifically in relation to the discovered graves.

Several of the victims are believed to be stateless Rohingya Muslims. In May 2015, over 3,000 migrants, mostly from Myanmar and Bangladesh, arrived by boat in Malaysia and Indonesia.