NEW : A tornado strikes Missouri early Monday , a county official says . Rescue crews were picking through the mangled metal remains of mobile homes as darkness fell Sunday . The storm was moving at about 50 mph when it hit the town of Joplin around 1 a.m. local time. Tornadoes tear through Oklahoma , Kansas , Illinois and Iowa . One person is killed in Pottawatomie County , Oklahoma .
NEW : A tornado strikes Missouri early Monday , a county official says . The storm was moving at about 50 mph when it hit the town of Joplin around 1 a.m. local time. Tornadoes tear through Oklahoma , Kansas , Illinois and Iowa . One person is killed in Pottawatomie County , Oklahoma .