8:58 AM PT -- Regarding the police scanner comments made about letting gang members shoot each other, CPD tells TMZ ... "The Chicago Police Department takes all allegations of misconduct by Department members very seriously."
They add, "CPD upholds and honors the expectation of Departmental professionalism at all times. CPD has initiated an internal investigation into the audio remarks captured on the alleged CPD radio transmission. The investigation remains ongoing."
A couple of Chicago PD officers allegedly chose to let a gang shootout play out amid the unrest over George Floyd's death ... at least that's what it sounds like on the citywide police scanner.
As violence and riots continued Monday night in Chicago, word came over the scanner at 9:27 PM of a shooting at Cermak and Spaulding. Cops were told ... "There's gangbangers vs. gangbangers. They're shooting across at each other."
The response ... one officer says, "Let 'em do it," and another follows up with "Let it be!"
Another call over the scanner immediately follows, confirming the gang members were shooting at each other at the same location. It's unclear if cops ever responded to the shooting.
We reached out to Chicago PD ... they tell us they're looking into the audio and its authenticity.
However, we've confirmed the audio went over the police scanner ... it's just a matter of who made the comments.
As we reported ... law enforcement sources have told us police radios have gone missing during the recent civil unrest and chaos, so it's possible the voices heard over the scanner are not cops.
In a similar case, an NYPD scanner broadcast a call to shoot and run over protesters ... which sounds like it came from officers but could have been someone else. NYPD is looking into it, as well.