Federal agents raided a North Side pharmacy Thursday.
The DEA shut down Midtown Medical Center in the Uptown neighborhood. An Uptown news site says the feds were investigating illegal prescriptions.
IRS agents were also reportedly on the scene and investigators brought boxes of evidence out of the building.
A 13-year-old boy was killed and at least 22 others -- including a 3-year-old boy -- have been wounded in shootings across Chicago since Friday evening.