phnom penh cambodian prime minister hun sen call unite state friday withdraw peace corps volunteer escalate row accusations u.s. agents conspire opposition leader plot treason hun sen respond u.s. embassy phnom penh issue travel warn urge citizens show caution amid anti-american rhetoric officials scar cambodians hun sen say unite state address garment workers factories export much production unite state prepare invade cambodia tell americans careful good pull peace corps hun sen say u.s. embassy decline comment previously dismiss accusations collusion opposition leader kem sokha call release friday embassy swear 71 new volunteer peace corps send americans abroad help local project state goal promote mutual understand hun sen say friday order investigation whether americans involve kem sokha opponents hun sen accuse arrest cambodia national rescue party cnrp leader kem sokha crack independent media critics ahead general election next year evidence present kem sokha video record 2013 discuss strategy win power help unspecified americans hun sen close ally china take series measure u.s. interest year end joint military exercise expel naval aid unit force u.s.-funded pro-democracy group leave thursday hun sen say suspend cooperation washington find remain americans kill vietnam war accord u.s embassy 500 peace corps volunteer serve work cambodia since 2006 provide english teach teacher train well community health education u.s. president john f. kennedy establish peace corps 1961 promote world peace friendship cambodia pm call u.s. withdraw peace corps volunteer