Tuesday's Colorado school shooting shares a rare connection with the Columbine massacre, expert says - CNN

1. Tuesday's Colorado school shooting shares a rare connection with the Columbine massacre, expert says  CNN
2. Colorado STEM school student Brendan Bialy helped disarm gunman  NBC News
3. 1 dead, 7 injured in shooting at STEM school in Colorado; 2 suspects detained  ABC News
4. At least 8 injured in school shooting in suburban Denver  CNN
5. How deadly Colorado school shooting unfolded  CNN
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