By Marissa Parra

CHICAGO (CBS) — Six people, including three teenage girls, were in the hospital Saturday morning after being struck by bullets in a mass shooting in Chicago’s Parkway Gardens neighborhood Friday night.

They were shot on the 6500 block of South King Drive shortly after 9 p.m.

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Chicago Police say it started inside an apartment and then spilled into a hallway. It’s not clear how many people were there, but at the first sound of gunshots, everyone ran out into the hallway. That’s when more shots were fired.

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The victims include two 14-year-old girls, a 15-year-old girl, an 18-year-old man, a 20-year-old man and a 23-year-old woman.

Two of the victims were being treated at Comer Children’s Hospital. Three of those injured were in critical condition Saturday night.

The other victims were taken to University of Chicago Medical Center and Stroger Hospital.

One of the people who was shot is known to police. Another was carrying a gun.

Police were working Saturday morning to determine what led to the shooting and had no information on the shooter.

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No arrests have been made. Area North detectives are investigating.