Administrators at Enterprise, Alabama High School --- where eight students died in Thursday's tornado -- were warned about possible severe weather nearly three hours before the twister struck.
It raises questions for officials about whether classes should have been dismissed earlier.
Warning sirens started going off about 10:30 AM. The giant tornado struck about 1:15 PM.
Residents living near Enterprise High School say they heard the warning sirens long before the tornado slammed into the brick building, collapsing a wall, destroying the stadium and destroying the gymnasium.
Victims were crushed in an avalanch of concrete and metal.
But, school officials say they had no chance to evacuate earlier because of waves of bad weather moving through the southeast part of Alabama.
Eight students were killed when the twister slammed into the school.