Rescuers were sifting through debris of homes in northeast Nebraska early Tuesday for people who might be trapped under the rubble after deadly twin twisters ravaged farming communities, NBC News reported. At least two people died and 16 were critically injured when the twisters touched down almost simultaneously a mile apart about 4 p.m. on Monday. National Guard members were deploying Tuesday morning to help local responders in Stanton, Cuming and Wayne Counties - all of which suffered severe damage. Nebraska Gov. Dave Heineman declared a state of emergency and was expected to visit the affected areas to survey the damage.