washington sanction myanmar withhold u.s. aid among options press country government stop attack rohingya muslims u.s. officials say thursday add must careful avoid worsen crisis want take action exacerbate suffer risk complicate environment deputy assistant secretary state patrick murphy tell u.s. house representatives foreign affairs committee hear hundreds thousands rohingya muslims flee myanmar rakhine state since security force respond rohingya militants attack aug. 25 launch crackdown unite nations denounce ethnic cleanse myanmar reject accusation insist action need combat terrorists kill civilians leave world community count cost international organizations government bangladesh take vast majority refugees race provide food water medical care many u.s. lawmakers clamor strong u.s. response crisis criticize government leader aung san suu kyi nobel peace laureate hugely popular washington fail representative ed royce foreign affairs committee republican chairman say recent statement deny military conduct clearance operations factually false say speak responsible atrocities must face justice military general must rise challenge ethnic cleanse royce say representative eliot engel committee top democrat one several committee members say washington reconsider decision ease sanction country military particular call myanmar allow international inspectors access rakhine state sit white shirt suit people slaughter throw country republican representative scott perry say somebody need take action add murphy say efforts way identify individuals responsible right violation representative ted yoho chairman panel asia subcommittee ask would effective suspend aid myanmar government allow u.n. inspectors rakhine state kate somvongsiri witness u.s. agency international development say would consider gravity situation obviously need look possible tool leverage table say u.s. officials cite need caution address rohingya crisis