The motive for a shooting that killed a teacher and a student and wounded others at a Wisconsin school appears to be a “combination of factors,” a police chief said Tuesday as he appealed to the public to share what they might know about the 15-year-old girl who attacked a study hall before shooting herself. MORE: https://www.wthr.com/article/news/nation-world/wisconsin-school-shooting-suspect-identified-victim-details/507-6a121663-bb9b-4486-94ed-f24a9392e884