Horrific details emerge in CTA train shooting that left 4 victims dead - NBC Chicago

1. Horrific details emerge in CTA train shooting that left 4 victims dead  NBC Chicago
2. Four passengers shot dead on Chicago-area commuter train, police say  The Washington Post
3. CTA Blue Line shooting in Forest Park: Charges expected after 4 killed on train, mayor says  ABC7 Chicago
4. 4 people were killed on a subway train near Chicago, apparently while sleeping, police say  CNN