The superintendent of the Texas school district where a 14-year-old girl shot and injured a student before turning the gun on herself says investigators don't believe the girls knew each other, the AP reports. Alpine Independent School District superintendent Becky Watley said Friday officials are still looking into possible motives for Thursday's shooting at Alpine High School. She says bullying hasn't been discussed during her conversations with investigators. Authorities say the 14-year-old died of an apparent self-inflicted gunshot wound in a bathroom near where the victim was shot. The victim was taken to a local hospital with non-life-threatening injuries. An expert says the case is rare, noting that more than 95% of fatal school shootings are committed by males. (More school shooting stories.)