It happened just before 2 pm Thursday outside of Village Liquor off First and Herndon.
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Officers found several shell casings and learned two cars were involved.
Around that same time, a shooting victim was dropped off at Saint Agnes Hospital in a black car.
Police followed that vehicle, stopped it, and detained three people who were inside.
They also recovered two guns that were thrown out of the car.
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They're still looking for a white car that drove away from the scene.
Eaton Elementary was locked down for about 15 minutes as the incident unfolded.
The victim is expected to recover.