21st anniversary of Columbine High School shooting

National News

Today marks the 21st anniversary of the mass shooting at Columbine High School.

On April 20, 1999, two Columbine seniors went on a shooting spree inside the school, killing 12 of their classmates and one teacher before committing suicide.

At least 20 others were wounded.

At the time, the Columbine shooting was the worst high school shooting in U.S. history.

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