The shooting inside Apalachee High School lasted about a minute, beginning in a hallway and ending in a classroom, Barrow County Sheriff Jud Smith told ABC News.
Within that minute, Colt Gray, the 14-year-old accused of opening fire at his Georgia high school, shot 13 people, Smith said.
Four of the victims died — two teachers and two students — but there would have been more deaths had it not been for the quick response and the emergency alert system the county installed a week prior, the sheriff said.