12:50 a.m. update: Moore officials tell ABC News the search and rescue operation at Plaza Towers Elementary School is now a recovery effort.
12:30 a.m. update: Residents will be allowed in to Oklahoma City neighborhoods where storm damaged occurred if they have proper identification, Capt. Dexter Nelson said.
Those leaving affected areas are asked not to return until after sunrise, and those coming in are asked not to leave the area again, Nelson said.
Damage assessment will continue in the daylight.