(CBS) — A 13-year-old boy was hit with a bullet while riding a CTA bus on the South Side when someone fired shots at a nearby gas station.

An adult pedestrian was also wounded in the incident, which occurred around 4 p.m. at 78th and Ashland in the Gresham neighborhood.

Police say the shooting was preceded by a fight at a gas station. Neither victim was an intended target of the shooter.

The 13-year-old bus rider, who was struck in the neck, was taken to Comers Children’s Hospital in serious condition, and the adult, who was shot in the ankle, was transported to Holy Cross Hospital in good condition.

Police say the boy is expected to recover.