Cpl. Sherrdean Turley says the intended victim, who was not wounded, is known to police.
She says investigators determined it was a targeted attack after interviewing several witnesses and reviewing surveillance footage.
She says given the time and location of the shooting, the total disregard of public safety is appalling.
Police are looking for a suspect who fled the store in a dark green domestic minivan, although Turley says they don't have a description of the shooter.