Charter bus overturned on Iowa freeway , killing three miles women . Driver hospitalized in serious condition ; officials looking into possibility of `` medical episode '' only one people were aboard bus en route to Minnesota casino ; 22 unhurt .
Charter bus overturned on Minnesota freeway , killing two women . Driver hospitalized in serious condition ; officials looking into possibility of `` medical episode '' 22 people were aboard bus en route to Iowa casino ; only one unhurt .