nairobi trappings proper poll station ballot-boxes pot indelible ink registration list dozen election officials dutifully seat behind school desks things miss voters nairobi kibera slum hot-bed support veteran opposition leader raila odinga many young men fail heed call peaceful stay-away thursday election re-run august presidential vote annul court open six hours late lack security poll station kibera olympic primary school come attack stone-throwing youths determine ward voters police gate respond volley tear gas follow live round send gang youths chant slogans president uhuru kenyatta scurry cover warren streets tin-shacks next school wall riot officer seal area make impossible even residents get let alone would-be voters prepare run gauntlet pro-odinga peer pressure want vote want go home say 24-year-old kevin ouma-sigiria turn back arm riot police block rubble-strewn road 500 metres 1500 feet school speak another man try talk way road-block receive prod chest wooden club follow nonchalant whack around ankles crisis one riot officer idenitified kevin say come one-by-one ok. gather crisis get big moments late 35-year-old say mohammed scurry street opposite direction wife three small children pack relatives live up-country good health say clutch children hand pop exloding tear-gas grenades echo across tin roof-tops opposition strongholds western kenya saw similar unrest cause election commission postpone vote weekend although little prospect 48-hour delay yield different outcome kibera poll station staff sleep overnight olympic school unable fear attack arrive arm escort 10am four hours vote mean start ballot box also escort heavily arm police contingent arrive hour chance use nobody go vote today say olympic deputy preside officer jaqueline onuko blithely tuck sandwich rock clang metal roof classroom-cum-polling station first time around busy ... queue morning nobody go come scar police neighbor nairobi slum rock-throwers police keep voters bay