Mass school shootings mostly happening in small-town America

FILE - In this Friday, May 18, 2018, file photo, mourners wait for the start of a prayer vigil following a deadly shooting at Santa Fe High School in Santa Fe, Texas. If you want to know where mass school shootings are most likely to occur, look no farther than small-town and suburban America. (AP Photo/David J. Phillip, File)
FILE - In this Friday, May 18, 2018, file photo, cars remain in the parking lot where they were left as the sun sets on Santa Fe High School, the scene of a deadly shooting earlier in the day with multiple fatalities, mostly students, in Santa Fe, Texas. If you want to know where mass school shootings are most likely to occur, look no farther than small-town and suburban America. (Mark Mulligan/Houston Chronicle via AP, File)

ATLANTA — If you want to know where mass school shootings are most likely to occur, look no farther than small-town and suburban America.