he uses the codename "sabo." >> sabo (in foreign language): (speaking foreign language) >> narrator:frontline" spent six months trying to corroborate the footage and other videos we gathered... >> narrator: ...interviewing scores of witnesses... (speaking foreign language) >> narrator:...comparing their accounts, and cross-checking them with human rights investigators. >> williams: how many patches of blood like this did you see? >> narrator: the myanmar military denies abuses and says it has been fighting islamic terrorists. (speaking foreign language) >> (weeping) >> narrator: but the videos and eyewitness accounts depict an orchestrated effort to target civilians. systematic discrimination, state-sanctioned violence, and ultimately, mass murder. (woman sobbing) >> sabo: (people talking in background) >> narrator: muslim rohingyas have been living in myanmar's rakhine state for generations. but the government views them as illegal immigrants from neighboring bangladesh. in 2012, violence erupted between the muslim rohingyas and the buddhist rakhines, the majority ethnic group in th