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According to Brad Garrett, a former FBI agent and current ABC News consultant, most school shootings last for about five minutes or less.

It takes much longer to clear the scene, however, since responding law enforcement officers need to methodically go through, room by room, to both secure and de-arm the shooter and to help students and faculty at the school, Garrett explained.

\"PHOTO:
Joel Auerbach/AP
PHOTO: Women embrace in a waiting area for parents of students after a shooting at Marjory Stoneman Douglas High School in Parkland, Fla., Feb. 14, 2018.
>

Former New York Police Department commissioner Ray Kelly said that bullying could be a possible factor in today's shooting, though the motive has not been confirmed.

\"We've seen it in so many cases,\" said Kelly, who is now an ABC News consultant.

\"We don't know for sure but I'm pretty sure there's an element of that here,\" he said, noting that the bullying could be \"real or perceived.\"

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