Texas school gunman posted messages about attack

Officials say an 18-year-old opened fire in a Texas elementary school Tuesday, killing 19 children and two adults in one of the worst school shootings in U.S. history. CBS News correspondent Janet Shamlian reports from the devastation in the community. Tanya Rivero, CBS News anchor, joins Lana Zak for more information.

I’m a journalist who specializes in investigative reporting and writing. I have written for the New York Times and other publications.