How did Professor X get paralyzed?

How did Professor X get paralyzed? In X-Men: First Class, moviegoers learn that Professor Xavier, leader of the X-Men, lost the use of his legs when Magneto deflected a bullet and caused it to accidentally sever his spine.

In X-Men: First Class, moviegoers learn that Professor Xavier, leader of the X-Men, lost the use of his legs when Magneto deflected a bullet and caused it to accidentally sever his spine.
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