The Central High School student, who was not identified, included 10 students from his school on the list, school officials said.
"The information was brought to us by students who printed off the list because it was causing a certain uncertainty and fear," Central High Principal David Hinson told the paper. "We contacted the parents of all the students on the list to let them know that we are taking all the necessary safety precautions."
Hinson said the student doesn't have a previous record of disciplinary problems.
Get More: Dallas Morning News