1. The tragedy came just half a month after a shocking mass shooting at a Colorado movie theater that claimed 12 lives and wounded nearly 60.
2. Friday's mass shooting in a Connecticut elementary school has again sparked a national discussion about gun control.
3. The shooting was believed to be the worst mass killing by a single gunman in Alabama's history.
4. mass shooting是什么意思
4. Other bombings and a mass shooting brought to at least 95 the death toll in Baghdad on the bloodiest day for such attacks in weeks.