Aurora, Colo. Shooting: Celebs React on Twitter

Celebrities take to Twitter in reaction to Aurora, Colo. shooting at "Dark Knight Rises" premiere.
For continuing coverage on Tragedy in Colorado: The Batman Massacre, tune in to “World News,” “20/20” and “Nightline.”

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Mark Kelly: "Gabby and I were horrified to hear of the tragedy in Colorado last night. Our thoughts and prayers are with the victims and their families." (Photo by Valerie Macon/Getty Images)
Mark Kelly: "Gabby and I were horrified to hear of the tragedy in Colorado last night. Our thoughts and prayers are with the victims and their families." (Photo by Valerie Macon/Getty Images)