We have not obtained a photo of Madeline Hsu, a 6-year-old who died in the attack on the morning of Dec. 14, 2012.
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A gunman shot his way into the school and gunned down 20 first-grade children and six educators. Adam Lanza fatally shot his mother inside their home before carrying out the rampage and then killing himself.
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Watch: Sandy Hook Promise's new PSA highlights warning signs of potential mass shootings
Sandy Hook PSA highlights mass shooting warning signs