Police reject calls for ban on assault weapons . Kara Devlin , Shawn Nottingham , Tina Burnside and Jennifer Feldman contributed to this report . The year - old boy was shot in the ear , and 12 other people also were injured . Chicago Mayor Max Emanuel cancels a trip to Washington after the shooting . Police call the shooting gang - related ; no suspects were in custody .
Police reject calls for ban on assault weapons . The year - old boy was shot in the ear , and 12 other people also were injured . Chicago Mayor Max Emanuel cancels a trip to Washington after the shooting . Police call the shooting gang - related ; no suspects were in custody .