geneva top u.n. human right official say would surprise court one day rule act genocide commit rohingya muslim minority myanmar accord television interview show monday u.n. high commissioner human right zeid ra ad al-hussein tell bbc attack rohingya well think plan ask myanmar leader aung san suu kyi stop military action zeid already call campaign textbook example ethnic cleanse ask rhetorically anyone could rule elements genocide late remark put case plainly toughen stance elements suggest rule possibility act genocide commit say accord excerpt interview provide advance bbc hard establish thresholds high say surprise future court make find basis see myanmar deny commit atrocities rohingya previously reject u.n. criticism politicization partiality myanmar military say crackdown legitimate counter-insurgency operation zeid say myanmar flippant response serious concern international community make fear current crisis could open phase something much bad tell bbc fear jihadi group could form huge refugee camp bangladesh even launch attack myanmar perhaps target buddhist temples say excerpt provide court could prosecute suspect atrocities myanmar member international criminal court referral court could do u.n. security council myanmar ally china could veto referral unite nations define genocide act mean destroy national ethnic racial religious group whole part designation rare international law use contexts include bosnia sudan islamic state campaign yazidi communities iraq syria almost 870,000 rohingya flee bangladesh include 660,000 arrive aug. 25 rohingya militants attack security post myanmar army launch counter-offensive u.n. investigators hear rohingya testimony consistent methodical pattern kill torture rape arson zeid say phone suu kyi january ask vain stop military operation nobel peace laureate suu kyi less two-year old civilian government face heavy international criticism response crisis though control general share power myanmar transition decades military rule u.n. 's zeid toughen warn 'genocide myanmar