Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. Since 2006, guns have been used in an average of 25 mass killings per ...

The mass shooting, one of several this year in the city, unnerved residents and left city officials pleading for help to both solve the crime and address the broader problem of gun violence.

Stories from mass shooting survivors and their loved ones, as well as new research, are creating more awareness of gun violence. A new study from the University of Colorado Boulder shows that 1 in ...