Students in this Oregon community won't be returning to classes on Monday as they continue to mourn three classmates and a teacher killed in the United States' latest school shooting, the motive of which is still unknown. https://cnn.it/47neWk1

The three children and a teacher shot to death at Silver Rail Elementary School in central Oregon were in a classroom dedicated to students with special needs – an environment that's supposed to be nurturing, safe and supportive. https://cnn.it/3UyM8lB

As school shootings have increased nationwide in recent years, shootings have become more common occurrences at homecoming and football-related events, too, according to a CNN analysis of shootings on elementary through college campuses. https://cnn.it/4dr6y6r