geneva top u.n. human right official monday denounce myanmar brutal security operation muslim rohingyas rakhine state say disproportionate insurgent attack carry last month communal tensions appear rise across myanmar monday two weeks violence rakhine state trigger exodus 300,000 rohingya muslims prompt government tighten security buddhist pagodas zeid ra ad al-hussein address unite nations human right council say 270,000 people flee bangladesh trap border amid report burn villages extrajudicial kill receive multiple report satellite imagery security force local militia burn rohingya villages consistent account extrajudicial kill include shoot flee civilians zeid tell geneva forum cite report myanmar authorities begin lay landmines along border bangladesh would require returnees provide proof citizenship rohingya strip civil political right include citizenship right decades add call government end current cruel military operation accountability violations occur reverse pattern severe widespread discrimination rohingya population zeid say situation seem textbook example ethnic cleanse last year zeid office issue report base interview rohingya flee bangladesh previous military assault say monday suggest widespread systematic attack community possibly amount crimes humanity deplore current measure india deport rohingyas time violence country zeid say note 40,000 rohingyas settle india include 16,000 receive refugee documentation note india obligations international law say india carry collective expulsions return people place risk torture serious violations u.n. see 'textbook example ethnic cleanse myanmar