KUTUPALONG REFUGEE CAMP, Bangladesh (Reuters) - Mohib Bullah is not your typical human rights investigator. He chews betel and he lives in a rickety hut made of plastic and bamboo. Sometimes, he can be found standing in a line for rations at the Rohingya refugee camp where he lives in Bangladesh.

Yet Mohib Bullah is among a group of refugees who have achieved something that aid groups, foreign governments and journalists have not. They have painstakingly pieced together, name-by-name, the only record of Rohingya Muslims who were allegedly killed in a brutal crackdown by Myanmar's military.