CNN analyst Juliette Kayyem is the author of the best-seller "Security Mom: My Life Protecting the Home and Homeland." She is a professor at Harvard's Kennedy School, a former assistant secretary of the Department of Homeland Security in the Obama administration and CEO of Zemcar. The opinions expressed in this commentary are hers.

(CNN) This newest shooting seems, sadly, familiar, but it is important that we pay attention to what is different here.

The deadly attack Friday in Santa Fe, Texas, left at least 10 dead. Terrified kids, shocked parents, authoritative law enforcement, inquisitive reporters, and somber politicians act as though they are slipping into some well-worn script.

This horror is real, but it is true that it is no longer rare: as noted by the Washington Pos t, the number of school children killed in school shootings in 2018 is "nearly double" the number of casualties of our service members.

Even so, the Santa Fe shooting does not fit the models we have seen before, most recently the mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, on February 14.

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The alleged assailant in this case, Dimitrios Pagourtzis, did not appear to have a criminal record or, so far as we know, any previous interactions with police or worrisome concerns from the community. He used two weapons -- a shotgun and a .38 revolver -- neither of which are the focus of gun control reforms.

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