The story

Students jumped out of windows and locked themselves in classrooms as a former pupil rampaged through a German school with a gun, killing at least a dozen people there Wednesday, a student at the school told CNN.

"Suddenly there were police standing in front of me and told us to run outside quickly," Luisa Santonastaso, 16, said. "At first we didn't know what to do. So first we went to the class and picked up some of our classmates and ran out.

"Then we heard that someone was inside shooting. Then we also saw a teacher who had blood on his hands because he wanted to help a female teacher who sacrificed herself for a student -- she stood in front of a student to protect her," the girl told CNN by phone from Germany. Read full article »

CNN's Marco Woldt and Lianne Turner contributed to this report

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