geneva humanitarian situation besiege eastern suburbs damascus outrage party conflict must allow food medicine reach least 350,000 trap syrians u.n. human right chief zeid ra ad al-hussein say friday shock image appear severely malnourish children emerge recent days frighten indication plight people eastern ghouta face humanitarian emergency zeid say statement tighten siege push people verge famine rebel enclave residents aid workers tell reuters remind party deliberate starvation civilians method warfare constitute clear violation international humanitarian law may amount crime humanity and/or war crime zeid say zeid office list several hundred people need medical evacuation government reportedly impose severe restrictions evacuations lead deaths several civilians u.n. statement say u.n. convoy last reach besiege area sept 23 aid 25,000 people food price rocket since force loyal president bashar al-assad take control several neighborhoods may destroy tunnel use smuggle goods siege month close eastern ghouta main access checkpoint impose big rise tax impose traders last week two food warehouse loot possible sign grow desperation u.n. statement say u.n. right chief decry hunger syrian siege demand aid access