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Caption:MARYSVILLE, WA - OCTOBER 24: Students and family members embrace after leaving Marysville-Pilchuck High School in the aftermath of a shooting on the high school's campus on October 24, 2014 in Marysville, Washington. At least two are dead, including the shooter, according to authorities, with several more wounded. (Photo by David Ryder/Getty Images)
Caption:MARYSVILLE, WA - OCTOBER 24: Students and family members embrace after leaving Marysville-Pilchuck High School in the aftermath of a shooting on the high school's campus on October 24, 2014 in Marysville, Washington. At least two are dead, including the shooter, according to authorities, with several more wounded. (Photo by David Ryder/Getty Images)

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Anderson Cooper speaks with Fmr. FBI Exec. Asst. Dir. Sean Henry about the best ways to respond to a school shooting.

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Anderson Cooper speaks with Fmr. FBI Exec. Asst. Dir. Sean Henry about the best ways to respond to a school shooting.