A joint report has found human traffickers may have committed crimes against humanity in Malaysia and Thailand.

The Human Rights Commission of Malaysia and Fortify Rights group say the crimes were mostly committed against Rohingya men, women and children at sea and in human trafficking camps.

The report documents how a criminal network deceived Rohingya refugees to board boats, later abusing them, enslaving them, and in some cases murdering them.

A mass grave believed to contain the bodies of more than 30 Rohingya and Bangladeshi refugees was found in Thailand in 2015. And 139 graves were also discovered at human trafficking camps in Malaysia.

Matthew Smith, an executive director of Fortify Rights, a human rights organization based in Southeast Asia in Kuala Lumpur, talks to Al Jazeera about the grim development.

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