geneva u.n. investigators start collect testimony flee rohingya muslims point human right violations myanmar military security force head fact-finding mission say tuesday marzuki darusman say u.n. team still try get myanmar permission enter country gather evidence refugees medics border town cox bazar neighbor bangladesh darusman team start work august month attack rohingya muslim insurgents myanmar trigger military response force 421,000 rohingya bangladesh past month myanmar deny right group accusations try drive minority community rakhine state say target militants initial information give allegations spell resolution reflect initial find team interview darusman tell reporters come reflect general report international media far happen u.n. human right council resolution set fact-finding mission mandate darusman team look allege recent human right violations military security force abuse myanmar particular rakhine state international media widely report plight rohingya account persecution myanmar military security force u.n. human right chief refer textbook example ethnic cleanse initial find would release within 10 days darusman say team suppose deliver full report march darusman tell geneva-based council timeframe utterly insufficient ask six-month extension myanmar ambassador htin lynn tell council myanmar make efforts restore peace law order proportionate security measure target terrorists take safeguard state security restore law order say continue believe institute mission helpful course action solve already intricate rakhine issue daunt challenge u.n. start gather testimony myanmar violations investigator