colombo unite nations wednesday raise concern safety rohingya muslim asylum seekers sri lanka buddhist monks hardline nationalists force flee u.n. shelter capital colombo refugees detain april along two suspect indian human traffickers boat sri lanka coast camp southern sri lanka ensure security incident capital tuesday incident sri lankan monks nationalists stone shelter prompt 31 rohingya occupants mainly women children flee safety witness say injuries report statement u.n. high commissioner refugees say incident alarm say refugees victims violence persecution myanmar 422,000 rohingya flee nearby bangladesh past month unhcr emphasize refugees ... need international protection assistance unhcr urge public concern refugees continue extend protection show empathy civilians flee persecution violence say rohingya stay buddhist-majority sri lanka colombo government approval unhcr provide assistance longer-term solutions find president maithripala sirisena government condemn attack refugees shameful urge police hunt perpetrators witness say monks storm safe house chant rohingyas terrorists accuse kill buddhist monks myanmar rohingya group flee myanmar 2012 live india refugees nearly five years try migrate illegally sri lanka lawyer represent tell reuters tension myanmar majority buddhists rohingya deny citizenship explode several time past years old enmities buddhist nationalism surface end decades harsh military rule exodus rohingya myanmar rakhine state since aug. 25 attack rohingya militants trigger military crackdown unite nations brand ethnic cleanse authorities myanmar bangladesh see stateless muslim minority nation problem unhcr alarm violence rohingyas sri lanka