Kansas City Shooting, Teens Seen on Camera Arguing Before Shots Fired

New video from the Kansas City shooting appears to show the exact moments before shots started to ring out -- and as the cops have indicated, there are teenagers in the mix here.

TMZ has obtained footage that depicts the KC rally Wednesday at 1:48 PM CT -- right around the time the first reports of a shooting came in -- and eyewitnesses tell us that the young guys you see in the background got into a heated exchange with someone off camera.

There are a few key players to focus on -- a teen in red, who you can see get angry and throw his bag down as he argues with someone who's not in clear view. There's also another teen in all black with a satchel-like bag hanging from his side, who walks toward the action.

These 2, in particular, were recorded walking away from the shooting just moments later -- also seen in the footage we got -- and the young man in black looks to have been shot.

We're told by eyewitnesses who saw this that he appeared to have been shot in the face. If you look closely, his buddy in red is trailing close behind him as they beelined it outta there.

Going back to the main video ... there are a couple other dudes who were pointed out to us who also seem to have been involved -- one young guy in a brown jacket (who looks to be the same guy who got tackled in that now-viral video) and another guy in a black jacket and red beanie ... whom we're told appeared to be reaching for something in his coat.

Our sources tell us all the young guys you can see on camera here all looked to be rolling together as a group -- and that they were bickering with a much taller and possibly older man off camera ... who our eyewitnesses say definitely fired the first shots at them.

It's not entirely clear if the young guys fired back, but we're told people there believe they might have ... although, you don't see them pull out or use a gun at all in these videos.

Of course, in the aftermath of this ... cops have only charged 2 individuals -- juveniles as they've been described -- with gun-related offenses, although more charges are likely to come.

The pieces of the puzzle are still falling into place ... and there are more questions than answers right now. From the looks of it -- this may have been an argument gone wrong.