Newark school officials are crediting a 24-hour telephone hot line with helping to prevent what they say could have escalated into a threatening situation. An anonymous call to the line on Tuesday led police to the home of a 14-year-old student, where they discovered a gun and ammunition. The caller said the Roosevelt Middle School eighth grader had threatened to shoot his classmates. Robert Reincheld was arrested on an unrelated drug charge and has been expelled from school. Security Voice of Dublin runs the safe school help line. A computer-controlled message device records toll-free calls from tipsters about potential violence, harassment, drug use or weapons in schools. Information is then forwarded to school officials. Around 450 Ohio districts use the hotline, which serves 12-hundred district nationwide.