Mark Gorman holds a candle during a vigil on September 4 for the slain students and teachers at Apalachee High School.
Mandatory Credit:	Mike Stewart/AP via CNN Newsource

Mark Gorman holds a candle during a vigil on September 4 for the slain students and teachers at Apalachee High School.
Mandatory Credit: Mike Stewart/AP via CNN Newsource

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From Algebra 1 to barricading doors: How the Georgia school shooting unfolded

The warning had come that morning by phone to Apalachee High School: There would be shootings Wednesday at five schools.