Chattanooga school bus driver Johnathon walker tried to pull the children off the bus, his mother told cnn. But there was too much blood.

Moments after the catastrophic crash Monday, walker called his mother and told her what happened.

" 'Mama, I love you. I have been in a drastic accident,' " Gwenevere cook recalled her son saying. "He texted me minutes later saying the kids are dead."

Five children died and at least 12 were hospitalized after the bus plowed into a tree and flipped over in the Tennessee city.

"He was trying to get (the children) off the bus -- all the bodies were limp," cook said. "There was blood everywhere."

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