The mass attack at Winder’s Apalachee High School was at least the year’s 45th school shooting in America. It typically gets 500 in a year, according to an academic study that claims it’s one of the first to quantify more than 1,000 threats of school violence over four academic years. Emily Elconin/Getty ImagesNo agency or group tracks all threats of US school violence, from possible gun attacks to bombings to any other conceivable danger. Atlanta Public Schools hadn’t warned caregivers so broadly of possible danger like this in at least a year, he said. The Fulton County Sheriff’s Office sent 11 motor and K-9 units to help that day, it later told CNN; the Atlanta Police Department deferred CNN’s questions to Atlanta Public Schools.

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