nairobi police fire teargas opposition supporters rally kenya capital nairobi monday call sack election board officials blame august botch presidential vote officer also clash crowd fire teargas western opposition stronghold kisumu force businesses close reuters witness say local media report scatter protest western towns port city mombasa kenya supreme court void aug. election cite irregularities without find individual election board responsible l5n1m119t president uhuru kenyatta august vote victory annul accuse supreme court bring country close judicial chaos opposition leader raila odinga supporters turn ire election board accuse wrongly hand august vote kenyatta supporters side trade insult accusations raise fear tensions could boil ethnic violence 2007 1,200 people kill dispute election capital east african economic powerhouse police fire round teargas small group several hours least three locations downtown business district reuters witness say meet election board british u.s. diplomats condemn inflammatory rhetoric politicians say undermine vote authorities preparations new election first signal western governments might take concrete action hate speech british diplomat tell reporters anyone find incite engage violence must hold accountable ... uk reserve right take appropriate action may include refuse revoke visa kenyatta odinga spar propose change election system prevent supreme court annul result raise doubt date re-run currently schedule oct. 26. kenyatta say monday opposition supporters accept supreme court timeline new poll cake eat say event nairobi celebrate court decision repeat election must also respect court decision election board preside repeat election within 60 days police fire teargas kenyan vote protesters