Hussein OnyangoBay Ledger News Zonebill@blnz.comtag:www.blnz.com,2009:people/hussein_onyangoSecurity tightened for Obama's Kenyan familytag:www.blnz.com,2009:2011/05/12/Security_tightened_Obamas_Kenyan_family_f911Kenya has tightened security around the home of US President Barack Obama's step-grandmother after the killing of Osama bin Laden, an official said Thursday.2011-05-12T16:24:32ZAFP Global EditionBy Staff Reporter