nairobi kenyan police fire teargas shots air monday hundreds demonstrators march capital nairobi protest propose legal change would make hard supreme court annul election reuters television footage show sport utility vehicle plough protesters severely injure three immediately clear responsible police make immediate comment incident kenya due oct. 26 repeat presidential election supreme court nullify aug. vote due procedural irregularities president uhuru kenyatta august election face opposition leader raila odinga uncertainty come election create turmoil east african nation regional trade hub staunch western ally demonstrators march toward election board nairobi reuters journalist saw men plain clothe near security force fire shots air police horseback set blockade prevent protesters access roads police also use teargas western city kisumu odinga stronghold disperse protesters though another demonstration coastal city mombasa pass peacefully odinga opposition alliance threaten boycott october vote unless electoral board change personnel stance decline monday clarify comment suggest keep options open democratic society live choose participate pre-rigged election process democratic right court order odinga say comment broadcast kenyan tv station without elaborate protesters want warn rule party lawmakers pass amendment election law would limit circumstances supreme court could void election procedural ground opposition lawmaker jam orengo say parliament pass law tomorrow like declare war kenyan people say justin muturi speaker national assembly say amendment could debate parliament reconvene tuesday lawmakers keen push forward say key part propose law stipulate candidate boycott election whose date already set remain candidate would win contest without formal poll hold government keen avoid constitutional crisis odinga pull last minute frustrate court order hold elections within 60 days muturi say try prevent crisis elections tell reuters phone government-backed kenya national commission human right say monday report least 37 people kill police crackdown protest immediately follow august vote high death toll give far report attribute deaths police use live bullets police bludgeon use club name 6-month-old baby girl 7-year-old boy 8-year-old girl among victims kenya police use teargas shoot air opposition march