seoul hundreds thousands rohingya muslims flee bangladesh violence myanmar drain trauma suffer crisis struggle overcome desperate want unite nations refugee chief say wednesday 600,000 rohingya flee buddhist-majority myanmar since late august year neighbor bangladesh drive military clearance operation rakhine state refugees suffer cause international outcry spur appeal aid agencies millions dollars fund tackle crisis find population almost response passive say filippo grandi u.n. high commissioner refugees describe visit late september camp refugees stay almost felt nothing leave everything drain tell reuters interview first visit south korean capital saw lassitude symptom trauma add see kind trauma long long time italian diplomat say maybe saw 90s central africa grandi coordinate un humanitarian activities democratic republic congo 1996-97 civil war success aid efforts unite nations non-government body depend myanmar government defuse hostility face humanitarian workers rakhine grandi say political work favor one community say contrary direct need members buddhist community need certainly qualify think important stress say grandi tension rise government aid agencies even spasm violence begin late august officials accuse world food programme aid insurgents high-energy biscuits discover july forest encampment authorities say belong militant group arakan rohingya salvation army longstanding antipathy among ethnic rakhine buddhists say un nongovernment body favor rohingya aid deliveries spike august protesters demand aid agencies leave u.n. warn staff rise hostility since aug. 25 militant attack rakhine government bar aid agencies except red cross organizations work state north curtail activities elsewhere state several case aid deliveries forcibly block rakhine buddhists u.n. office coordination humanitarian affairs say world food programme resume food distribution northern rakhine month limit access mean agencies still know many people internally displace last three months access remain restrict humanitarian actors northern rakhine prevent reach many people need agency say central rakhine humanitarian organizations also continue face access constraints rohingya refugees 'drained trauma say u.n. refugee chief