A 1 a.m. shooting at a party in downtown St. Louis kills one and injures nearly a dozen. Gunmen open fire during a fight near Florida's Hollywood Beach, injuring nine, including a 1-year-old. Bursts of gunfire at a Sweet 16 party in Dadeville, Alabama, kill four and wound more than 30.
What these and other recent mass shootings share in common is they all involve suspects in their teens, highlighting what can be a deadly mix of teenage bravado and impulsiveness with access to guns.
