`` We 'll continue to urge BP to leverage additional assets , '' Secretary of Homeland Security Janet Napolitano said Friday as she toured the area . NEW : Fishing and tourism come to a halt in many areas . U.S. wildlife official warns of ` ` multi - decade impact '' from BP . Dispersants to be found near spill site Saturday , BP says . President Obama says he will visit the spill area on Sunday .
NEW : Fishing and tourism come to a halt in many areas . U.S. wildlife official warns of ` ` multi - decade impact '' from BP . Dispersants to be found near spill site Saturday , BP says . President Obama says he will visit the spill area on Sunday .