A 17-year-old girl was shot when a fight broke out outside a Jewel-Osco store in the South Loop Tuesday night, Chicago police said.

Police said they are speaking to a person of interest in the case.

Just after 10:30 p.m., police responded to a call for a person shot outside the Jewel-Osco in the 1200 block of South Wabash Avenue. Officers found a 17-year-old girl with a gunshot wound to her right thigh.

The teen was taken to Northwestern Hospital in good condition. She is expected to recover.

Witnesses said an argument erupted between the girl who was shot and the security guard outside the store. He said the teen threw a plastic beverage container at the security officer, and that's when the guard took out their handgun and shot her.

Those at the scene said the guard sped off after the shooting. Police pulled over and arrested someone, and detectives said they are speaking with a person of interest.

CBS News Chicago spoke with security guards on duty Wednesday afternoon who are directly employed by Jewel-Osco. They said they are not armed, but were not sure if the same is true for the night shift.

They said they get threatened all the time.

Jewel-Osco officials are working with Chicago police, a spokesperson confirmed.