DEADLY SHOOTING TMZSports.com
The Sunday afternoon shooting at a Detroit Lions tailgate party that resulted in the loss of two lives was all captured on video ... and, warning, the footage is graphic.
In the clip, obtained by TMZ Sports, you can see several men were out at Eastern Market in downtown Detroit following the Lions' loss to the Tampa Bay Buccaneers at Ford Field ... when an argument breaks out.
At least half a dozen people can be seen exchanging words .