Mayor Brandon Johnson is responding to yesterday's fatal shooting of four people on a Chicago Transit Authority train. WBBM's Nancy Harty reports that he blames a lack of gun control.

Photo credit Terry Keshner

<p>Mayor Brandon Johnson is responding to yesterday's fatal shooting of four people on a Chicago Transit Authority train. WBBM's Nancy Harty reports that he blames a lack of gun control.</p>
<p>Photo credit Terry Keshner</p>

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