"We can only make decisions based on the information you had at the time. You don't have hours to reflect on it," Steger said.
The 9:26 e-mail had few details:
"A shooting incident occurred at West Amber Johnston earlier this morning. Police are on the scene and are investigating." The message warned students to be cautious and contact police about anything suspicious.
Until Monday, the deadliest shooting in modern US history was in Killeen, Texas, in 1991, when George Hennard plowed his pickup truck into a Luby's Cafeteria and shot 23 people to death, then himself.
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