NEW : A tornado strikes Missouri early afternoon , a county official says . ` ` We do n't know for sure that it 's over yet , '' says an official . Tornadoes move through Oklahoma , Missouri , Illinois and Indiana . One person is killed in Pottawatomie County , Oklahoma .
NEW : A tornado strikes Missouri early Monday , a county official says . `` We do n't know for sure that it 's over yet , '' says an official . Tornadoes tear through Oklahoma , Kansas , Illinois and Iowa . One person is killed in Pottawatomie County , Oklahoma .